岸田幸（清野菜名）和腿脚不自由坐着轮椅的妈妈邦子（和久井映见）住在狭仄的旧公寓里，平时多有口角。为躲避家中阴湿的氛围，纱织每天在连锁餐厅拼命打工到深夜。邦子写的明信片被广播电台节目选中而获得一次电台赞助旅行的机会。为了让纱织放松心情，邦子要求她代替自己去参加旅行。在旅行巴士上，纱织认识了大大咧咧的野田翔子（岸井雪乃）和小巧可爱的樋口若叶（生见爱瑠）。在离开了周围人的陌生环境中，三人终于能够敞开心扉尽情释放自己。一场命运的邂逅，让三个身处不同生活环境，却都对日常生活感到疲惫不堪的女孩，萌发出“我想和她们在一起”的心心相印之情……

Kasumi Aiko is a high school girl who is the star player in the basketball club. Aiko has a short, blonde hair and looks masculine. One day, she works part time at her brother's maid cafe and wears a long-hair wig. She then caught the eyes of Amano Reo, who is the handsome ace of the basketball club and Aiko's rival. Aiko was flustered and called herself "Mai". Reo on the other hand, fell in love with "Mai" and confessed.

When a classically trained young conductor meets a free-spirited pianist at music school, their romance and their music have a hard time harmonizing.

Yasuhiko is a transfer student to a classroom with Miyuki. She barely notices him until he suddenly appears before her in the library. The truth comes out: Yasuhiko is from the future. Bound by this special secret, they become closer and closer. Yasuhiko reveals that this trip is inspired by a book from Miyuki’s era, a book, she later learns from her future self, that she authored. On the day of his departure, Miyuki makes a promise, that she will write that novel to treasure this unforgettable summer, just as her future self says. Ten years later, the book is about to be published. As Miyuki waits to reunite with her past self, nothing happens! Did something go wrong in the past? Are there more secrets to come?