This Boy Suffers From Crystallization

Ayumu Tamari has a condition known as Crystallization Syndrome, where his body parts crystallize and become immobile in times of high stress. This is often triggered by his severe social anxiety, which prevents him from speaking to his classmates and leads to frequent crystallization episodes. As a result, he has to repeat a year in high school. Ayumu finds comfort in his homeroom teacher, Kouya Onihara, who collects and studies crystals and shows a unique interest in Ayumu's condition.