One of ArS's members, Akio is a glass artist with a talent for delicate work—think glass beads and small intricate pieces. He's kind of a gloomy guy and tends toward the negative, but he's genuinely passionate about things that sparkle and shine, which is why he's drawn to Hikaru Orihara's ice sculptures. Shiki Amabe basically looks out for him when he's in one of his depressive moods, and they end up collaborating pretty often because of it.
Growing up with brutal sisters messed with his head—he developed gynophobia that's serious enough to make him hide away during lives and events, which fans often note as a pretty defining part of his personality.
Content compiled by AnimeList.moe from publicly available sources.