After losing his mother, Masahiro lives with just his father. His father struggles to balance work and child-rearing with one arm, so Masahiro has been living as a NEET. Then, his father remarries, and his new stepmother Anna arrives. Shocked by the state of their rundown household, Anna starts by cleaning up Masahiro's room to improve his life. However, Masahiro becomes increasingly hostile towards Anna for invading his territory and begins to plot revenge…
