My younger sister (girlfriend) loses her virginity to an insidious nerd

The blockbuster doujin game based on the original drawings by popular manga artist [Hiromitsu Takeda] has been turned into an animation! It carefully depicts how the girlfriend he loves platonically is cuckolded and falls into love. [STORY] Saki Mizuhara was spending happy days with her brother-in-law, Shuji, as platonic lovers. One email shatters those days. ``To my lover Saki'' - What was sent along with the meaningless text was a secretly filmed image of Saki changing clothes and masturbating. Realizing that he is a stalker, Saki goes to the "date" place instructed by the other person in order to stop any further threats...©Pin-Point/MediaBank/studio9MAiami