Miki Ryouta, a junior high school student, appears to be getting along well with his single mother, but behind the scenes she's terrified of her son's every move and for good reason—he's secretly keeping track of every mistake she makes. His classmate Kasai Kaoru is fed up with his overprotective parents instead and thinks it's his mother's fault that he is bullied. One day Ryouta saves Kaoru from being bullied, and the two have their first conversation...

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