Koi to Yobu ni wa Kimochi Warui

Ichika Arima saves businessman Ryou Amakusa from falling down a staircase, then later discovers that he is her best friend's older brother. Ryou is accustomed to effortless attention from women, so Ichika's blunt rejection of his smug flirting surprises him. Instead of backing away, he treats her dislike as a challenge and begins showering her with messages, gifts, and unwanted persistence.

Ichika makes her discomfort and boundaries clear, but repeated encounters also reveal sides of Ryou that his usual charm conceals. If he truly wants her to see him differently, he must learn that persistence alone does not create affection and that her feelings are not something he can simply win.