OBD-075 - I ordered a delivery girl and my grandma showed up

Tsubasa lives with her son's family and grandson. She's known for her quirky personality, but lately, she's been dressing up and going out often, which her family ignores. Little do they know, she has a secret job. One day, her grandson Kazuki calls a delivery service while home alone. When he opens the door, he's shocked to find his own grandmother standing there!