Yawai Emi is taking care of her three grandchildren, whom she raised as her own. She helps them financially and takes care of all the household chores.

She was particularly uninterested in raising her three grandchildren because her daughter Ema did not want to raise them herself. It was common for her to leave her young children with her and go out at night.

Her daughter became even more uninhibited since her husband passed away, and has started to prioritize herself even more. Fortunately her grandchildren cooperate with each other and support one another.

Then one day... By chance, Emi finds a piece of tissue that smells like semen in the trash bin. At that moment, a thought occured to her. "They're men, and there are things only I can do for them."

This, Emi begins to reward her grandchildren for their hard work.

[From official site]