Yonhyakunijuu Renpai Girl (Light Novel)

Haru Tsuwabuki must successfully confess his love to one of 420 girls, or he will die (in more ways than one). However, as soon as he enrolls, he is derisively labeled a lowly "parasitic biting insect," and his adolescence descends into darkness. One day, Haru meets Miyako Dokuutsugi, a beautiful girl with the worst misfortune at the academy. Haru's life descends from darkness even lower into hell.