Oniichan Asa made Zutto Gyutte Shite!

Four sisters conduct their lives by a strict set of rules. Four sisters — Sora, Akane, Kohaku, and Sumi — have each established their own specific conditions for how their older brother is allowed to hug them. Ten seconds minimum, a sniff required, and genuine affection mandatory. It sounds like a quirky domestic setup, and honestly, that's exactly what it leans into before things get considerably more intimate from there. This is a 4-episode hentai OVA adapted from a visual novel, so the premise is upfront about where it's headed — the sibling closeness escalates well beyond affectionate hugging. Each episode essentially spotlights the distinct personality of a different sister, which gives the series a bit more character variety than you'd typically expect from something this short. The contemporary household setting keeps things grounded in that slice-of-life aesthetic, even as the content goes in an adult direction. If you've watched anything like Oniichan no Koto Nanka Zenzen Suki Janain Dakara ne or Recently, My Sister is Unusual and wanted something that skips past the teasing and commits fully to explicit content, this is essentially that. Studio 1st keeps the visual style clean, with distinct designs that actually differentiate the four sisters from one another rather than making them feel interchangeable. It's a short runtime, the characters are relatively charming for the format, and it doesn't pretend to be something it isn't.