Just as Kaoru begins to adjust to hiding his love for Aoi while living with three other girls, a new girl arrives! Mayu Mizuki has been living abroad with her parents, but has returned to enroll in college and pursue her childhood crush on Kaoru- but will Aoi give her the lessons she needs to reach Kaoru's heart? Meanwhile, Kaoru secretly starts multiple part-time jobs to buy a special gift for Aoi, but Aoi suspects Kaoru is avoiding her. Will their love be able to withstand the pressure of doubt and new distractions?