SeeIn AO

Kyoya, a teacher, had his memory wiped clean in an accident, and since then a young woman named Miyu has been looking after him, a gap in his life that quietly shapes everything around it. That setup alone creates something quietly uncomfortable: he doesn't fully know who he is, she's deeply attached to him, and the feelings between them have grown into something complicated. Then you find out Miyu has a twin sister, Yumi, who is actually an android built by their late parents, and Yumi has her own feelings stirring beneath the surface. For a 2-episode OVA from 2001, SeeIn AO packs in more emotional texture than you'd expect. The oceanic city setting gives everything a hazy, dreamlike quality that suits the amnesia angle well. It's less about explicit content and more about the tension between memory, identity, and connection, who does Kyoya become when he can't remember who he was? If you've watched something like Bible Black and appreciated when adult anime actually tries to build a mood before everything else, this sits in similar territory. Fans of Discipline: The Record of a Crusade who enjoy character-driven dynamics will find the human-android relationship here worth exploring. It's a short watch, adapted from a visual novel, so the story moves quickly but keeps its emotional beats intact. Not a masterwork, but genuinely more thoughtful than its runtime suggests.