Shouwaru Tensai Osananajimi to no Shoubu ni Makete Hatsu Taiken wo Zenbu Ubawareru Hanashi

Yoshizawa Wakaba's childhood friend Umezono Komaki acts like a talented, well-behaved honor student, but she can be a vicious girl who looks down on others behind her mask. In order to regain the dignity that Komaki has stolen from her, Wakaba challenges her to a game, but Komaki tells her, "Every time I win, I will take away one of your precious things." Every time Wakaba loses to the girl she "hates," her true feelings become more exposed.
(Source: Young Ace Up, translated)