Manga Like Negatte mo Nai Tsuihou Go kara no Slow Life? Intai Shita Hazu ga Nariyuki de Bishoujo Gal no Shishou ni Nattara Naze ka Mechakucha Natsukareta

"Adventurer registration canceled? I don't mind. I was thinking about retiring anyway." Reito Harukaze, who had climbed to the highest adventurer rank, has his adventurer license revoked by the guild that manages dungeons. The cancellation of Reito’s registration, an SSS-ranked adventurer, causes chaos within the guild. However, as he had already been considering retirement, Reito remains unfazed and uses this opportunity to retire and live a slow, quiet life. "Hey, big brother, buy me a meal!" One day, at the park, he meets Karen, an incredibly beautiful girl who is struggling with money. Hearing her situation, Reito decides to give her a simple lecture to help her conquer a dungeon. "Thanks to you, I was able to clear my first dungeon! Master!" "Let’s not use 'Master' outside the dungeon, okay..." As they venture into dungeons together, Karen grows attached to Reito and starts admiring him as her mentor, unaware that he’s actually an SSS-ranked adventurer. Gradually, she begins to fall for him. "Could it be that Master is actually really strong...?" Reito was supposed to be enjoying a peaceful, slow life in retirement, but instead, he finds himself adored by a rookie adventurer girl—what will happen next? Thus begins the unintentional, overwhelming fantasy of a former strongest adventurer starting from his retirement!