An omnibus OVA where three elementary school students, Manabu, Ryota, and Mina, deal with mysteries they encounter at their school. This OVA is split into two stories of 15 minutes each: "Poisonous spiders at school" and "Hanako-san's hand".

This OVA is based on the "Hontoni Atta Kowai Hanashi" series derived from the "Hontoni Atta Gakou Kaidan" series published by Asahi Sonorama.