Twintail, Attacking Brother and Sister.Nao briefly spots a twin-tailed girl, similar to what appeared in Shüsuke's photo album. At school that day, a girl named Iroha Tsuchiura joins Nao's class and makes friends with Nao. Iroha later comes to Shūsuke, reintroducing herself as his childhood friend and kisses him, proclaiming they are lovers due to games of Doctor they played when they were young. Shüsuke feels ashamed of his past perversion, throwing away all his porn and his perverted nature, which causes Nao to grow concerned...