Shinka Jikkyou -Pandora no Hako-

Kouichi Itoda. He was an introverted type. In spite of this he had a girlfriend from the same class, who was beautiful, kind, and rather out of his league. Kouichi worried about this a lot. One day an incident happened near the school. A package arrived from one of her male friends. Kouichi was suspicious and opened it... That was the night it all went to hell. His false happiness was obliterated. Faced with a choice.