Persisting Kanzashi to be his partner, Ichika looks up on maintenance assistance for Kanzashi's personal IS, but it's not that simple. Meanwhile, upon realizing Ichika insists on pairing with Kanzashi for the tag tournament, the girls take their time training more aggressively. As Tatenashi devises Houki to team up with her, she analyzes Houki's physical maneuver, surprisingly to learn that her aptitude is up to level S already. When Kanzashi takes her IS, Uchigane Nishiki, for a test run, it malfunctions, then Ichika saves her before she crashes. Having a change of heart towards Ichika, she indirectly agrees to be his partner. Then Ichika shares data from Byakushiki to help improve Kanzashi's IS, and has other students gladly help. Returning to his dorm room, Tatenashi insists upon Ichika for another massage, talking how important younger siblings can be for their elders, knowing how strict they can be for their protection. Hoping to give Ichika sweets as a gift, Kanzashi reaches his door only to overhear that Ichika's generous offer was Tatenashi's idea, leaving her heartbroken.