The person who moved in next door... was an eccentric and airheaded older sister!?

Kotani lives in an apartment with thin walls. After some past neighbor trouble, he was living quietly until a new neighbor moved in. At first glance, she has a cute atmosphere... but she was steadily preparing for the arrival of the Ice Age! Naked health methods, hand-drill fire making... A "on the edge" comedy spent with a slightly off-beat neighbor!