Tensei Shitara Budouha Reijou!?: Koishinakya Shinjau Nante Murige desu

Is this seriously the world of a "game"? If I don't romance one of the yanderes, I would die!? Before my reincarnation, I was a former delinquent and a top-class brawler who was once called the "Crimson Rose" or the Crimson Demon", who had gathered the interest of other delinquents. It's easier to talk with fist than to talk about love, so naturally my romancing skill is zero. Despite this, it seems that I have reincarnated as a game's heroine who has a family of good standing and a gentle appearance! In order to protect my life while cooperating with the investigation of the incident, I will try my best to fall in love, but... The person herself hasn't realized it. Serina, the daughter of an Earl and a former delinquent...