Source: https://kakuyomu.jp/works/16817330652677973473
Synopsis
When the main character, Yuuto, was one year old, his birth mother died of illness……4 years later, his father remarried and got divorced.
When his father remarried, he loved his three sisters who were his stepmother’s children, as if they were his real sisters, but the divorce separated them from his life.
10 years later, he had a chance to meet again in college–.
Episode 2 – Exchanges Between the Three Sisters
Episode 6 – Three Sisters Side
Episode 7 – Until Meeting Again
Episode 17 – Side, Three Sisters After Returning Home
Episode 18 – The Next Day at Campus