クラス内カーストトップの清楚ギャル・茨戸七海に罰ゲームで告白されて付き合うことになった陰キャ男子・簾舞陽信。
しかし罰ゲームのはずが、七海は陽信にガチ惚れしているようで…?
Barato Nanami, a toned-down version of the gal at the top of the school pecking order, lost a game of cards and now has to confess to a guy in her class as a punishment. Misumai Youshin, who is a loner with no friends was the chosen guy but he knows about the punishment! It should have been a game punishment, but will Nanami grow feelings for Youshin…?