Keikenchi Chochiku de Nonbiri Shoushin Ryokou: Yuusha to Koibito ni Tsuihou Sareta Senshi no Mujikaku Zamaa

When his girlfriend is stolen away by the hero, Toru finds himself expelled from his S-Rank party. Heartbroken and hurting, he encounters a demon outside the city and defeats it—and in that moment, his ability breaks past all limits! In the blink of an eye, Toru reaches level 300! Wielding power that far surpasses any hero's, nothing can stand in his way. On his journey, he meets Kaede, a slave, and together they form a party known as the "Manyu Brigade." The group clears dungeons with ease, claims legendary sacred weapons, and—thanks to Toru's skills—his companions level up effortlessly. He even rescues a countess ambushed by bandits on the road and befriends a legendary beast. And so Toru's journey continues at its own leisurely pace, bringing him one new encounter after another along the way—while his former party of heroes, deprived of every chance to shine, steadily falls into decline.