Nonoshita Yuuna and Tomoki live in a single-mother household. Though they are stepmother and stepchild, they are close like a normal family. Despite having their share of difficulties, they lead a happy life.

However, the son has a problem... Perhaps because he is in his puberty, he frequently has wet dreams.

Eventually, his mother notices, and the two of them try to do something about it...

[Translated from the official site]