Dave Grohl just walked on stage at Anime Expo 2026, and within seconds he broke the internet. The Nirvana and Foo Fighters legend didn’t come to tease a tour or an album — he came to announce that Nirvana’s “Breed” will be the opening theme song for one of the most beloved manga of the decade. And just like that, the anime everyone was already hyped for got 10 times bigger.
The show in question? “The Guy She Was Interested In Wasn’t a Guy At All” — the smash-hit manga fans worldwide affectionately call the “Green Yuri.” It’s getting a full anime adaptation from the powerhouse studio CloverWorks, set to premiere in 2027. Here’s everything you need to know, and why this might be the biggest crossover moment anime has had in years.
What Is the “Green Yuri”? A Quick Crash Course
Before the anime even existed, this manga was already a cultural phenomenon. Created by Sumiko Arai, the story began life as a short comic posted directly to her Twitter account back in 2021. It blew up almost immediately, went on to win the Next Manga Award in 2023, and today sits at a staggering 2.8 million copies in circulation.
The premise is pure gold:
- Aya is a fashion-forward, upbeat high schooler who secretly loves rock music — but feels like nobody around her gets it.
- She falls head over heels for a mysterious, cool, all-in-black employee she meets at a CD shop.
- The punchline? That “cool guy” is actually Mitsuki — her own quiet, avoidant female classmate who’s terrified of revealing the truth.
It’s a classic rom-com misunderstanding wrapped in a gorgeous, instantly recognizable green-tinted art style — hence the nickname. Fans couldn’t stop sharing it, and five years later it’s one of the biggest property launches of the 2020s.
Dave Grohl, Nirvana, and the Viral Moment Nobody Saw Coming
The announcement that “Breed” — a raw, driving track off Nirvana’s legendary Nevermind album — would open the series was casually dropped by Grohl himself during Crunchyroll’s showcase. It’s the kind of “mainstream rock meets anime” fusion that usually exists only in fanfiction, and the internet reacted accordingly.
Why does this pairing work so perfectly? Because music is the beating heart of the story. Aya’s obsession with rock is what drives the entire plot. Having a genuine grunge anthem from arguably the most iconic rock band of the ’90s as the opening is not just a gimmick — it’s thematically perfect. It’s the sound of the record Aya would absolutely lose her mind over.
It also signals that the anime industry is thinking bigger than ever. When a legend like Dave Grohl personally shows up to announce a theme song, you know the anime business has officially gone mainstream.
Why CloverWorks Is the Perfect Studio Choice
Fans had been speculating about the studio for months, and the reveal of CloverWorks was met with near-universal approval. The studio behind Bocchi the Rock! and Horimiya has a reputation for delivering precisely the kind of vibrant, emotionally resonant character animation this series demands.
Director Masashi Ishihama (known for Children of the Whales and the Persona films) is at the helm, with voice actresses Mariya Ise and Akari Kito lending their talents. That’s a stacked creative team for a series with so much riding on it.
What Fans Are Already Worried About
Of course, no major announcement comes without its fair share of anxiety. The fandom’s biggest worry is that a delicate, slow-burn story — one so famous for its soft, restrained character work — could get oversaturated or rushed. There are also the usual fears:
- Will the iconic green visual identity translate to animation without losing its charm?
- Can the music-taste references do justice to how central rock culture is to the manga?
- Will 2027 feel like forever, especially after the record-breaking moments of series like Frieren’s legendary stage concerts?
But honestly? A theme song reveal this bold has a way of quieting the doubters. If “Breed” is a sign of the level of care being poured in, we’re in for something special.
The Bigger Picture: Anime Just Broke the Rock Ceiling
This is more than one show’s theme song — it’s a landmark moment. We’ve seen anime shows pack arenas with orchestral concerts and stage events reaching heights like Carnegie Hall. We’ve watched streaming giants invest heavily in weekly releases after fan pushback, just like the Steel Ball Run saga. Now, we’re watching genuine grunge royalty hand their most famous song to a yuri anime about a girl who loves rock.
That’s not a niche crossover anymore. That’s culture colliding at full speed.
Theories and Speculation: What Could Come Next?
Here’s where the fun really starts. Fans are already spinning wild theories about what the opening sequence could look like, and honestly, the possibilities are delicious:
- Could the ED feature another iconic rock track, turning the whole soundtrack into a ’90s grunge love letter?
- Could CloverWorks pull off a full-on music video-style OP that leans into Aya’s fantasy of rocking out with Mitsuki?
- Could Dave Grohl’s involvement mean a cameo or an original track further down the line?
One thing’s for sure: if the team behind this adaptation is willing to reach this high for the opening theme, they have something special planned. All we can do now is wait for 2027 — and keep “Breed” on repeat until then.
The Verdict
“The Guy She Was Interested In Wasn’t a Guy At All” was already poised to be one of the most anticipated anime of 2027. With CloverWorks animating it, a beloved source manga, and now a literal Nirvana anthem as its opening, it has officially become appointment viewing. This is the kind of event that reminds you why you fell in love with anime in the first place — the moment two worlds you love slam together and create something nobody saw coming.
So tell us: are you hyped for the Green Yuri anime, and how do you feel about “Breed” as the opening theme — genius or a curveball? Drop your thoughts in the comments below!
