"Ahh..." Makoto, a university student staying with his brother's wife, has yet to recover from the shock of being dumped by his beloved girlfriend. His Sayuri-in-law Sayuri, unable to bear seeing him like this, calls out to him to cheer him up. "Now, cheer up... you can massage as much as you like," "...What!?" His sister-in-law bares her breasts and demands that he massage them. Makoto can't contain his excitement at the sight of his sister-in-law's beautiful big breasts, which are incomparable to those of his ex-girlfriend. This happened one night when his brother was away on a business trip.