通常攻撃が全体攻撃で二回攻撃のお母さんは好きですか？波打ち際のお母さんは好きですか?

This unaired thirteenth episode of the TV anime finds Masato Oosuki and his mother Mamako taking a beach vacation with the rest of the party to thank their ally Shirase. When Masato loses his memory after an accident during the trip, he becomes fixated on Mamako in a way that unsettles everyone around him, and the rest of the party is left to sort the situation out.