This Boy Suffers from Crystallization

Tamari Ayumu suffers from Crystallization Syndrome, a 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 is a story from auteur anime director Soubi Yamamoto about anxiety, depression, and love.