Itsuka Tenma no Kuro Usagi: Kokoro Utsuri no Toukoubi - School Attendance Day
Japanese title: いつか天魔の黒ウサギ 心移りの登校日 ~すくーる·あてんだんす·でぃ~
Type: OVA
Episodes: 1
Source: Light novel
Genres: Action, Comedy, Romance, Supernatural, Ecchi
Studios: Zexcs
Duration: 24 min
Rating: PG-13 - Teens 13 or older

Episode bundled with the ninth volume of the Itsuka Tenma no Kuro Usagi novel.

Includes Mirai's chibi-style dream, body-swapping and a crossover with Densetsu no Yuusha no Densetsu.