My stepmother has begun cleaning.

Masahiro lives with his mother and lives with his father. With just his father's skill, he is unable to balance work and child-rearing properly, and Masahiro lives a NEET life. At that moment, her father remarried and became a stepmother, and came to her. Surprising to see the rough house of a single-parent family, he begins by cleaning Masahiro's room in an effort to improve his life. However, Masahiro, who has come into his territory and has so much backlash, plotting to harass him to push him away...