Green Green Thirteen: Erolutions

When a group of girls shows up for a weekend visit at his all-male boarding school — which is on the verge of going coeducational — Yuusuke Takasaki finds himself with unfinished business, specifically with one of them, Futaba Kutsuki. They've been thinking about each other since they last met, both clearly interested, both too awkward to just say it. There's also a mysterious girl named Midori who keeps appearing in their dreams, nudging them toward each other in ways that blur the line between memory and something stranger. That's the romantic core of it, anyway. Be aware going in that this is a single OVA from 2004, adapted from a visual novel, and it leans hard into adult content — this is hentai, not just fanservice. The comedy is there, and the central relationship between Yuusuke and Futaba has some genuine warmth to it, but the explicit material is the main event. If you've seen the original Green Green series and wanted more closure on these characters, this delivers that alongside everything else. If you're coming in fresh, think of it as sitting somewhere between the tonal space of Kiss x Sis and Yosuga no Sora — relationships with real emotional stakes wrapped in content that doesn't shy away from anything. It's short, it's comedic in stretches, and it's pretty straightforward about what it is.