Summer Memories ~Girls who were cuckolded~ Another story / 夏の思い出~寝取られ堕ちた彼女達~ Another story

Asumi is a bright and energetic girl.

She is childhood friends with her main character, Mamoru, and with her parents' permission, they live together during the summer vacation.

Mizuki, who is her identical twin sister and her older sister, has feelings of admiration and jealousy for her.
She suppresses her feelings for Mamoru and lives with her.

She thought this summer would go by as usual, but...