Ayumu Tamari suffers from a condition known as "Crystallization Syndrome." In moments of high stress, parts of his body begin to crystallize and become extremely difficult to move. Unfortunately, Ayumu's severe social anxiety makes him completely unable to speak to anyone in his class, and ultimately causes him to crystallize so frequently that he has to repeat a year in high school.
Ayumu's only solace is his homeroom teacher, Kouya Onihara, whom he affectionately refers to as "Oni-chan Sensei." Kouya collects and studies crystals, and he finds Ayumu's crystalline body both beautiful and fascinating. With his stress from school compounded by the complexities of a forbidden student-teacher relationship, Ayumu struggles to find normalcy in his life while managing his emotions and trying to prevent complete crystallization.
[Written by MAL Rewrite]+ More
Characters & Voice Actors
Recommended for you
Chibi Maruko-chan: My Favorite Song
Movie
93m
Ringing Bell
Movie
46m
Emma: A Victorian Romance - Intermission
Special
24m
Gantz
TV
22m
Halo Legends
ONA
16m
Joker Game
TV
23m
Witchy Pretty Cure!
TV
24m
A3! Season Spring & Summer
TV
23m
Blue Gender
TV
23m
Kokkoku
TV
23m
Maria†Holic
TV
24m
Roujin Z
Movie
79m