OBD-075 The delivery girl is an old lady Tsubasa Fuyuki

Tsubasa lives with her son, his wife, and their grandson in a three-generation household. She has a lively personality and often surprises those around her. Lately, she's been going out more frequently with makeup on, but her family doesn't pay much attention. However, Tsubasa has a secret part-time job... One day, her grandson Kazuki is home alone. Seizing the opportunity, he calls a delivery health service. The doorbell rings, and when he opens the door, his heart pounding, it's... Grandma Tsubasa!