Tazuna and his new friend Koyori have a problem: If Tazuna lets go of Koyori's hand, she'll die! Can he take her home with him and explain to his parents why he now has to live with a girl? And how's he going to take a bath with her!?
Tazuna meets Chizuru and Hayate, the pair whose car he fixed on the day he met Koyori. They're workers for a major food corporation in the area, and they offer to treat him and Koyori to dinner as a thank you.
Tazuna is a young boy who loves to fix things. But his life takes an unexpected turn when he meets a girl who's lying on a hospital bed in an electronically locked lab. When he takes her hand, he finds out that he can never let go!