My father left for another woman. Since then, Toshiya's Kokoro aches whenever he sees his mother Yuna's sad expression, who no longer smiles. From now on, I'll support you. Toshiya tries to be close to his mother with pure feelings, but... Yuna is so lonely that she wants her body from her son. But I love my mother like that too... Toshiya decides to accept his mother and step into the forbidden world.