Ever since he broke up with his first girlfriend, his brother-in-law has lost all motivation to do anything and has become a living corpse. Worried about his brother-in-law's perpetual despair, his sister-in-law Ayaka makes a drastic decision. "How much longer are you going to keep worrying about it? Here, look at this and cheer up!" He becomes embarrassed and runs away when Ayaka comes on to him, baring her breasts, but his crotch gets hard from her huge breasts, which are incomparable to those of his ex-girlfriend...