Akari is a young woman who feel timid after a failed relationship. While at a party, she meets a younger man, Izumi, and although she struggles to forget her ex, she befriends him. Things seem to be going well between the two of them, until one day she is shocked to discover that Izumi is the younger brother of her ex-boyfriend! Adapted from the manga series "Brother Trap" (ブラザー・トラップ) by Hinata Kyo (日向きょう).