Natsuko Oominato is a girl in her twenties, always having a smile on her face. She's always considerate and caring of the people around her. She's a bit clumsy, but despite that, everybody loves her. Up until... she went missing.

You were walking late one night when you see a pregnant woman on a tall apartment building and had gone insane. "Everyone! Watch me!" And she jumps down. You have to catch her NOW!