Watashi no Nankou Furaku no Hitotarashi

The transfer student, Okonogi, is instantly captivated by his classmate, Hayase, whose mysterious charm is impossible to ignore. On impulse, he confesses his feelings—only to receive an unexpected "Yes!?" It turns out Hayase, overwhelmed by constant admirers, just needed a fake boyfriend to reject unwanted confessions. Okonogi is fine with being a temporary boyfriend, but rather than making Hayase fall for him, he finds himself completely wrapped around Hayase’s finger. The more Hayase playfully keeps him on his toes, the deeper Okonogi falls…

(Source: Houbunsha, translated)

Note: Includes one extra chapter.