The protagonist, Koichi, an ordinary college student, has a childhood friend. Her name is Yumi Sannomiya. She confessed her feelings to him a long time ago, but back then she was plain-looking and not his type at all. Now, however, she’s rapidly blossomed into a stunning woman—with voluptuous, full breasts, a firm, curvy butt, and a sensuous figure that’s completely transformed her. “You said you liked me, right? I’d go out with you now.” “After all this time? I really didn’t have a good eye back then…” Koichi, who had assumed Yumi would accept him as a matter of course, confessed only to be flatly rejected. Just then, Yoko Nishino, a “gal” from his class who happened to be there, mocked him, causing Koichi to harbor a one-sided grudge. Suddenly, an app was installed on this hapless guy’s smartphone. “No way… seriously? Can I really get revenge on those guys with this app!?”

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