Tensei Shite Seichou Cheat wo Teni Iretara, Saikyou Skill mo Tsuita no desu ga!?

High school student Hayato Katsuragi is reincarnated as Rayvelt Runwalker, the son of an aristocrat from another world, after a traffic accident. At the time of his reincarnation, the goddess bestows upon him a cheat skill with no level limit, but at the same time, he also acquires the most dangerous skill, "One Who Has Been Struck by Difficulties." Condemned to a life on hard mode, Ray decides to undergo intensive training to become stronger. While undergoing training, he lives a happy life surrounded by his cute maid and younger sister, but then a horde of monsters invades...!? (Source: CMOA, translated)