Sumire is the protagonist's childhood friend, having grown up closely together since youth. She's bright, energetic, and mischievous—completely opposite to the protagonist's personality. As they spend more time together in school, Sumire gradually matures into a beautiful young woman, and the protagonist begins developing feelings for her. One day, he confesses his love, but Sumire puts him on hold, saying she's in the middle of exam season. Instead, she declares, "I'll test whether you're worthy of being my boyfriend," and the virgin protagonist must now face her challenge. Always cheerful with a radiant smile, Sumire is a positive and driven girl who serves as student council president. As childhood friends, she too has secretly harbored feelings for the protagonist as they've grown. Congratulations on KMP's 20th anniversary!!