Imouto to Sono Yuujin ga Ero Sugite Ore no Kokan ga Yabai

What begins as Kanata helping his younger sister Miu and her friend Riko with their studies quickly proves to be anything but straightforward when both girls make it very clear they have more than homework on their minds. What starts as study sessions at home turns into something considerably more complicated when Kanata realizes he's caught between two people who are openly competing for his attention — and neither is being subtle about it. This is a 2-episode OVA from 2016 by Collaboration Works, adapted from a visual novel, so the story moves quickly and doesn't spend much time on buildup. The tone leans lighthearted — there's genuine comedic chemistry between the three characters before things get intimate, which gives the relationships a bit more texture than you'd expect. The animation holds up well, particularly in how character expressions carry the humor and the emotional beats. If you've watched Imouto Paradise! or Kiss x Sis and enjoyed that mix of comedy and close-quarters romantic tension, this sits comfortably in that same space. It's not trying to be anything other than what it is — a short, breezy hentai OVA with a familiar setup executed with decent craft and characters that have a little more personality than the genre often delivers. Two episodes means it's a quick watch, and the source material gives it slightly more grounded character work than a lot of comparable titles.