A boy who literally crystallizes under stress builds a fake personality to hide it. His geology teacher who collects stones notices him anyway. The romance that blooms is tender precisely because it starts with someone seeing through the performance to the fracture underneath.

Ayumu Banri has a problem. Stress turns his body to stone, and he cannot find a place among his classmates. After repeating a year of high school, he resolves to have a sparkly youth of his own, so he makes his hair and clothes more stylish and keeps constant watch on popular topics to stay current. While he keeps up this front, his homeroom teacher Kouya Onihara, a geology teacher who loves stones, tells Ayumu that his transformation is beautiful. Ayumu begins to fall for Kouya, who starts offering him advice. The result is a one-episode OVA that mixes fantasy and romance around an unusual illness and a student's feelings for his teacher.