Aitsu o yoroshiku

Koharu (26) is looking for a new job and she has older brother, Taichi (29 years old) who has taken care of Koharu in place of her mother who died in an accident when she was young. One day, Taichi disappeared from the sight of her family. Koharu and Taichi's fiancée Aki (age 25) head out to find Taichi.