It’s contains of 4 romantic stories by Mayu Shinjo sensei.
Naoki always sneaks into yayoi’s bed every morning. They are such a sweet family. Since she knew that Naoki was adopted, yayoi always had a feeling for her big brother. Fortunately, he has the same feeling…and bla bla bla…you know what happens next on Mayu Shinjo’s work!!! Ha ha