Shizuka is asked by her mommy friend Kazumi to look after her son Satoshi while Kazumi is in Okinawa for a relative's wedding. Satoshi fell off his bike a week ago and was injured, so he can't move. "We're in the same boat when we're in trouble, so don't worry about it, just go and see him," Shizuka says, readily agreeing. She heads to Kazumi's house to look after him, but she makes a big mistake because of her huge breasts!