During the summer vacation period, temporary teacher Honoka Kimijima is in charge of a supplementary class. One day, a female student suddenly jumps off from the school rooftop and dies in front of Honoka Kimijima. Then she notices a mystery student who is not supposed to be there.

• Shochiku
• Shibuya Nagisa
• Hayase Ikoi
• Soma Santoki
• Towa Araki
• Shota Sometani
• Satoru Matsuo
• Makita Sports
• Tomoko Hoshi