Four siblings are shocked to learn their adopted brother is actually a visiting alien and his time on earth is soon coming to an end. Will they be able to cope with his departure and also save the family yakiniku restaurant?

Rena Misaki works at a bank. She lacks self-confidence. Because of a reason, she begins working for a PR company and her boss is Kusakabe. As she struggles to work under her new boss, Rena Misaki grows as a person.