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～
Isekai-gaeri no Kensei wa, Jibun no Jitsuryoku ni Kigatsukanai: SSS Rank no Kakushi Quest wo Ukete Kaettekitara Level 1 no F-kyuu Tansakusha ni Natta kedo, Isekai de Kitaeageta Kenjutsu ga Tsuyosugite Oujo ya S-kyuu Eiyuutachi ga Ore wo Hanattekuremasen
"The Weakest Explorer," Akizuki Yuuta had accepted a hidden quest and was sent to another world. His daily life changed to a very hard adventure, continuously fighting against an endless amount of powerful monsters. And so, when he returned from another world, although he had gone back to being level 1, he had retained his otherwordly swordsmanship skills...! The weakest explorer has become the strongest sword saint! The unyielding warrior returns from another world! (Source: Kodansha, translated)