The manga centers on Karin, a young woman whose mother is an adult manga creator. When Karin's mother remarries, she gains an older stepbrother who is close to her in age, and a younger stepsister. Her stepbrother Kouichi is handsome but often sexually harasses her. And her stepsister Miki has a brother complex and dislikes her. The manga follows this new family with three stepsiblings in adolescence.
 
(Source: Anime News Network)
 
Note: Started as a series of five one-shots, the first of which was titled "Beautiful Monday" and published in Feel Young 2016-07 issue on June 8, 2016. The one-shots are collected in the first volume of the series. Official serialization started under the title "Beautiful Everyday" in Feel Young 2018-07 issue on June 8, 2018.

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