Gomen Asobase, Tonogata-sama! 100-nin no Ikemen to no Flag wa Subete Orasete Itadakimasu

Guy reincarnates into the world of an otome game as the heroine, but since his favorite character is actually the love rival, the "villainess," he'll crush his romance flags with all 100 of the game's love interests to steer his bias into a happy ending.