Following the death of his younger brother, Mitsuru's mother has become cold towards him. He is bullied at school, develops a dark and brooding personality, and lives in the shadow of his father who is perfect at work, athletics, and practically everything else.

When his father also unexpectedly passes away, his life drastically changes. His mother Mayumi has been crying every day since his father's death, but makes an effort to get closer to her remaining son. The two bridge the gap with some physical contact that had never existed before...

Mayumi comes to love Mitsuru from the bottom of her heart, and Mitsuru also begins to love Mayumi. Mitsuru's dark personality gradually brightens...