Mahiro and Ritsu have been friends since birth. Ritsu always teases her even now, but he's getting more handsome and popular every day... "I heard that he turns down every girl that confesses to him, but does he have someone he loves...?" Just as that question needles her, the two of them are to do a test run of the cultural festival's "Escape Game." They did say it was aimed at couples, but "do naughty things in front of each other"? What's up with that!?