Sennou Skill de Isekai Musou!? Iya Kore Motteru no Baretara Shokei sareru node Kenzen Seijitsu ni Ikiyou to Omoimasu

Hugh, a young noble with memories of his past life as an overworked corporate drone, just wants to live freely in this new world. But the skill he's been granted? A brainwashing ability that can dominate anyone! Fearing execution if his dangerous power is exposed, Hugh vows never to misuse it. However, during the academy's entrance exam, he's forced to reveal his skill! In a desperate move, he tries brainwashing himself and discovers a cheat-level ability to freely alter his own skills. Determined to live an honest life, Hugh plans to keep things wholesome—until, without even using his brainwashing, he's suddenly swarmed by beautiful girls declaring, "Be my one and only knight!" and "I'll do anything for you!" Why are they so obsessed with him!? A wholesome, heartfelt fantasy of unmatched brainwashing skills and a high-affinity harem begins! (Source: Overlap, translated)