Natsu no Musumetachi: Himegoto (2017)

Natsu no Musumetachi: Himegoto 2017 / 夏の娘たち　ひめごと 2017 / Summer Girls: Secret , 夏の娘たちひめごと

Naomi returns to a small town nestled in a mountain valley to care for her dying foster father. Reuniting with her younger step-brother, Hiroyuki revives a secret past between them. Their relationship at one time transcended that of sister-brother and developed into a sexual liaison. Naomi's love for Hiroyuki is rekindled, but those feelings waver in the face of her childhood friend, Yoshio, who likewise returns to town. (Source: JFDB)