
Quick answer — Azusa Mitsu worked on Amagami SS+ plus (Theme Song Performance), Amagami SS (Theme Song Performance), Amagami SS: Sister (Theme Song Performance) and 2 more anime.
Azusa Mitsu worked on Amagami SS+ plus (Theme Song Performance), Amagami SS (Theme Song Performance), Amagami SS: Sister (Theme Song Performance), Astarotte's Toy EX (Theme Song Performance), Astarotte's Toy (Theme Song Performance).