Saya Tokido works nights for a school committee that exists to wipe out a hidden organisation, and when Riki Naoe blunders into one of her operations she signs him up as backup. The other two volumes hand the lead to Sasami Sasasegawa and then to Kanata Futaki, each with a story of her own inside the same school. All three come from the Ecstasy edition of Key's Little Busters!, which added routes the first release did not have.