Wataru thinks this must all be a dream, because “it can’t be true!” He is “Big Brother” to Karen, “Dear Brother” to Sakuya, “Brother” to young Kaho, and “Bro Bro” to younger Hinako. Despite their affection and charm he still investigates, vainly, for any way off the island and out of his surreal dream. Unexplained and spooky sounds and events around the house lead Wataru to meet his eight other sisters. All twelve are gathered together when Mami, the girl who is still tailing him, is spotted; and she lies and says she also is a sister of “Bud”, making Wataru think he has 13 younger sisters!