Quartet

An 18-year-old named Hirosaki Naoya moves in with his younger siblings and their new stepsister Yukari after his mother remarries. Their parents are away on a honeymoon, leaving the four to start life together in a new home. Yukari works at an office and is described as attractive. The narrative includes three one-shot stories titled *Kyou no Obentou to Nan daro na*, *Natsuiro no Omoide*, and *Choukan*.