Ř1, D4: Teruto now has eight chips in his possession after claiming victory against Naomitsu. Sakura goes to meet Teruto so they can find Rebuild Battle challengers. When she gets there, she discovers that Hiyori has asked Teruto to give her special Build-Divide training. Teruto refuses at first, but reluctantly accepts after Hiyori entices him with his favorite foods. The three head toward the school store and make an unexpected discovery. Meanwhile, a girl asks Ishinome to take her to Teruto. Ishinome agrees knowing that something interesting may happen and sets a trap to lure Teruto. What is the girl’s objective?