Gensou Mangekyou: The Memories of Phantasm
English title: Touhou Fantasy Kaleidoscope: The Memories of Phantasm
Japanese title: 幻想万華鏡 ~The Memories Of Phantasm~
Type: OVA
Episodes: 18
Source: Game
Genres: Fantasy
Producers: Manpuku Jinja
Duration: 16 min per ep
Rating: PG-13 - Teens 13 or older

Marisa, an ordinary magician, suspects a youkai is behind the winterly weather in the middle of spring. She goes off to investigate and soon arrives in the netherworld, facing the youkai behind the strange incident. Will her friend, the shrine maiden Reimu, arrive in time to save the day or will all be lost?

(Source: AniDB)