Yurishia tries to get Kizuna interested in her, and convinces him to spend the day exploring the Megafloat with her. That evening he encounters Hayuru who talks about her ambitions. She falls, and when he catches her, she has an instant Hybrid Heart. He also meets Aine and learns more about her. She wants to Hybrid Heart to compete against the other girls, but Kizuna cannot do it mechanically. Later, Reiri tells him about Aine who as a little girl was found lost with amnesia. She was taken in and trained but without knowing about her past. Reiri also reveals they have recently discovered that if an Amaterasu's Hybrid counts drops to zero, they will die, which is why Kizuna is an essential part of Defense Academy's strategy.