100 Girlfriends Season 3 Unveils Yaku Yakuzen Character Visual and Rie Kugimiya Cast Reveal

If there is one thing The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You has taught anime fans, it is that the series has absolutely no interest in playing by the usual harem rules. Just when you think Rentaro Aijo’s increasingly ridiculous love life cannot possibly become any stranger, Season 3 introduces another soulmate who somehow manages to make the entire situation even more chaotic. And honestly, after watching Episode 8, I have to admit that Yaku Yakuzen might be one of the wildest additions to the Rentaro Family yet.

The Season 3 anime has been moving at an almost absurd pace since its July 5, 2026 premiere, constantly throwing new personalities, jokes, romantic situations, and completely unhinged character dynamics at the audience. The latest spotlight belongs to Yaku Yakuzen, whose standalone character visual was revealed following Episode 8. But the visual itself was only half of the surprise. The production also confirmed that legendary voice actress Rie Kugimiya will portray Yaku, Rentaro’s 16th girlfriend. For longtime anime fans, that casting announcement alone was enough to make this reveal feel much bigger than a normal new-character introduction.

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Yaku Yakuzen Is Probably the Most Ridiculous Character Concept Yet

Yaku is difficult to explain without making the entire premise sound like a fever dream. She is the grandmother of Kusuri Yakuzen, meaning that Rentaro’s already enormous relationship web is now connected to another generation of the Yakuzen family. That would be unusual enough, but 100 Girlfriends obviously wasn’t satisfied with stopping there.

Yaku is 89 years old, a former military combat medic with a lifetime of experience, old-fashioned habits, and the personality of someone who has lived through an entirely different era. The catch is that she looks like a tiny eight-year-old girl because of the effects connected to the Yakuzen family’s experimental drug formulas. This contrast between her appearance and her actual age is exactly the kind of bizarre character idea that this series loves to turn into comedy.

What I particularly like about Yaku is that the joke isn’t simply that she looks young. Her personality creates the real comedy. You have this tiny character carrying herself with the confidence and experience of an elderly woman who has seen almost everything, while everyone around her has to process the fact that she looks like a child. It is such a strange combination that it somehow feels perfectly at home in the world of Rentaro.

The newly revealed visual captures that contrast surprisingly well. Yaku’s traditional appearance gives her an old-fashioned elegance, while her small stature immediately creates the visual punch the series needs. She looks adorable, ancient, intimidating, and completely ridiculous at the same time. That’s basically the 100 Girlfriends formula in one character.

Rie Kugimiya Was an Inspired Casting Choice

Then there is Rie Kugimiya.

This is the part of the announcement that made me genuinely excited. Kugimiya is one of those voice actresses whose voice is instantly recognizable to anyone who spent enough time watching popular anime during the 2000s and 2010s. She became particularly famous for her legendary tsundere performances, with characters such as Taiga Aisaka from Toradora!, Shana from Shakugan no Shana, and Louise from The Familiar of Zero becoming essential parts of anime history.

But reducing Kugimiya to her tsundere roles would be unfair. Her performance as Kagura in Gintama demonstrates just how much comedic range she has, while her work as Alphonse Elric in Fullmetal Alchemist proves that she can deliver an entirely different emotional register when necessary.

That makes her particularly interesting for Yaku.

The character requires an unusual vocal balance. Kugimiya needs to sell the adorable appearance while simultaneously communicating that there is an 89-year-old veteran behind those words and mannerisms. One moment can demand a cute, youthful delivery, while the next needs the authority of someone who has spent decades surviving difficult situations.

Personally, I think this is exactly the sort of role where an experienced voice actress can make a character dramatically better than the written concept alone suggests. Yaku could have easily become a one-note gag, but the right performance gives her another layer.

The Rentaro Family Has Officially Gone Completely Off the Rails

At this point, trying to describe the Rentaro Family as a conventional harem is basically pointless.

The whole appeal of 100 Girlfriends is that the series takes familiar romantic-comedy ideas and keeps pushing them until they become absurd. Rentaro doesn’t simply collect girlfriends as a running joke. He genuinely commits himself to loving every one of them, regardless of how complicated the situation becomes.

Yaku makes that philosophy even more entertaining because of the generational connection.

You already have Kusuri, the chaotic scientist and Yaku’s granddaughter. Now her grandmother is also part of Rentaro’s romantic life. That creates an entirely new family dynamic that feels like something the writers deliberately designed just to make viewers ask, ‘How did we get here?’

And somehow, that is exactly why I love this anime.

Instead of trying to hide the ridiculousness of its premise, 100 Girlfriends embraces it completely. The show understands that the audience is already aware of how absurd the situation is, so it simply keeps escalating.

Why Fans Are Having So Much Fun With Yaku

The reaction to Yaku’s arrival has been exactly what I expected from the 100 Kanojo community: memes, disbelief, character discussions, and people immediately talking about the Rie Kugimiya casting.

A few things seem to be driving the excitement:

• Yaku’s bizarre age-and-appearance contrast creates endless comedy possibilities.
• Rie Kugimiya’s casting gives the character instant voice-acting credibility.
• Her connection to Kusuri creates another hilarious family relationship inside the Rentaro Family.
• Her military background gives her a completely different personality from most of Rentaro’s girlfriends.
• The character design fits the colorful, exaggerated visual identity of Season 3.

What I find especially funny is how normal this development has started to feel within the show’s universe. In almost any other romantic comedy, adding an 89-year-old grandmother who physically resembles a little girl would completely destroy the tone. Here, the audience’s reaction is basically, ‘Yeah, that sounds like 100 Girlfriends.’

That is a sign of how successfully the series has established its own rules.

Season 3 Keeps Finding New Ways to Avoid Feeling Repetitive

One concern I had before Season 3 was whether introducing so many girlfriends would eventually make the show feel repetitive. Somehow, that hasn’t happened yet.

The third season has continued expanding Rentaro’s relationship circle with characters such as Chiyo Iin, Nadi, Yamame Yasashiki, Momiji Momi, and Kishika Torotoro. What keeps things interesting is that each character seems to represent a completely different type of comedic scenario.

That is where the adaptation’s pacing becomes important. With such a huge cast, it would be incredibly easy for certain characters to disappear into the background. Instead, the anime keeps searching for different combinations of personalities and relationships, allowing the comedy to come from the interaction between characters rather than simply from introducing another girlfriend.

Yaku is a perfect example of this strategy. Her biggest strength isn’t just her individual personality. It is the number of new combinations she creates with characters who are already established.

Her scenes with Kusuri alone have enormous comedic potential.

The Production Team Understands What Makes the Manga Work

Bibury Animation Studios has continued the energetic approach established in the earlier seasons, and Season 3 benefits enormously from that confidence. The series composition by Takashi Aoshima and direction from Hikaru Sato have helped preserve the manga’s intentionally exaggerated sense of timing and comedy.

That is particularly important for a series like this because the jokes often depend on speed. A reaction that lasts two seconds too long can completely change the punchline. The anime needs to move rapidly between romantic sincerity, visual absurdity, exaggerated expressions, and fourth-wall-breaking humor.

So far, Season 3 has largely understood that rhythm.

The music also plays an important role. The score by Shuhei Mutsuki, Shunsuke Takizawa, and eba gives the show enough flexibility to jump from ridiculous comedy to surprisingly sincere emotional moments without making the transitions feel completely disconnected.

What Yaku Could Mean for the Rest of Season 3

With Yaku now joining Rentaro’s ever-growing family, I am expecting the remaining episodes of Season 3 to become even more chaotic.

The obvious attraction is the comedy, but I am also curious about how the anime handles Yaku’s unusual perspective. An 89-year-old former combat medic suddenly finding herself involved in Rentaro’s absurd modern romantic life gives the writers plenty of opportunities for jokes about technology, culture, family, and generational differences.

And then there is Rentaro himself.

The funniest part of all of this is that Rentaro will almost certainly take Yaku completely seriously. No matter how ridiculous the circumstances become, his dedication to his girlfriends remains sincere. That sincerity is what separates 100 Girlfriends from many parody-style harem series. The show makes fun of the genre while still allowing its protagonist’s feelings to be genuine.

That balance is surprisingly difficult to pull off, and I think it is one of the main reasons the series has developed such a passionate fanbase.

Final Thoughts

Yaku Yakuzen’s arrival is exactly the kind of escalation I want from The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You. It is strange, unexpected, slightly ridiculous, and completely committed to the show’s central idea that there are no limits to how complicated Rentaro’s love life can become.

But for me, the biggest win is Rie Kugimiya.

Casting an anime veteran with that much comedic and dramatic experience for such a strange character feels almost too perfect. If Kugimiya can fully capture the contrast between Yaku’s tiny appearance, elderly wisdom, military experience, and chaotic comedic potential, she could become one of the standout additions to an already enormous cast.

At this point, I’m not even asking how Rentaro is going to reach 100 girlfriends anymore. I’m asking how the production team is going to keep finding characters who somehow make the previous level of insanity look completely reasonable.

And honestly, I can’t wait to find out.