This Boy Suffers from Crystallization (2014)

Tamari Ayumu suffers from Crystallization Syndrome, crippling illness which causes his body to start turning to crystals whenever he becomes anxious or depressed. He chases after the romantic affections of his teacher, Onihara Koya, who spurns him at every turn, unwilling to accept love from a student.

This Boy Suffers from Crystallization is an anime movie featuring Shouta Aoi and directed by Soubi Yamamoto.

This Boy Suffers from Crystallization is currently streaming on Crunchyroll Amazon Channel.

It is also possible to buy This Boy Suffers from Crystallization on Amazon Video and Apple TV.