A sensual, dream collaboration between J-cup busty actress Nanami Matsumoto and KNUCKLE HEAD! A long-awaited live-action adaptation! ]

Even at home, his heart was always lonely.
Amano Ayumu, a young man somewhat reclusive, couldn't find his place in the world.
When his strict, brilliant older brother and his brother's wife come to live with them, Ayumu's life quietly begins to change.
As he increasingly closes himself off to his brother's cold, intrusive words,
it's only the gentle gaze of his sister-in-law that warms his heart.

Her smile, her voice, her presence...
becomes a part of his heart that he unknowingly finds himself drawn to.
And then, he can't look away from her voluptuous body.
Even though he knows this is a relationship he should never enter into,
his emotions and desires drive him ahead of reason...