Isekai Kaeri no Kensei wa, Jibun no Jitsuryoku ni Kigatsukanai ~SSS Rank no Kakushi Quest wo Ukete Kaettekitara Level 1 no F-kyuu Tansakusha Ninatta Kedo, Isekai de Kitaeageta Kenjutsu ga Tsuyosugite Oujo ya S-kyuu Eiyuutachi ga Ore wo Hanatte Kuremasen~

Also known as 異世界帰りの剣聖は、自分の実力に気がつかない～ＳＳＳランクの隠しクエストを受けて帰ってきたらレベル１のＦ級探索者になったけど、異世界で鍛え上げた剣術が強すぎて王女やＳ級英雄たちが俺を放ってくれません～ / The Sword Saint Who Returned from Another World isn't Aware of His Own Abilities: I Came Home After Completing an SSS-Rank Hidden Quest and Became a Level 1 Explorer, but the Swordsmanship I Honed In the Other World was So Strong that the Princess and S-Rank Heroes won't Leave Me Alone