Two teenagers who had never met before formed a bond on an extremely ordinary day. She was a "caterpillar" with a weird temper, fiery temperament, and no fear of anything (note: a caterpillar is a one-stranded mollusk), but she was very considerate of her friends; he was a cold-blooded fool who was not good at getting along with others, but he was also a fool who could help his only friend. Two teenagers who were incompatible with each other had a ridiculous story.