魔王を倒したLv999の老騎士、褒美に廃温泉を選んだら、湯に浸かった魔物が次々と聖獣へ進化

A level 999 old knight, who defeated the Demon King and saved the world. When the King offered him any reward he desired, he chose not gold, silver, or a noble title, but a deserted hot spring deep in the mountains. The old knight, weary from long battles, intended to spend his remaining years peacefully in the hot spring. However, the moment a wounded demon wolf, a weakened baby dragon, and an abandoned slime entered the spring, a miracle occurred. The ferocious demon wolf transformed into a divine sacred beast. The tattered baby dragon became a legendary sacred dragon. The ordinary slime became an angelic spirit. It seems this abandoned hot spring not only heals the wounds of monsters, but also has a mysterious effect of awakening their hidden powers. The retired, strongest old knight and the sacred beasts that are evolving one after another. A deserted hot spring, unknown to anyone, gradually transforms into a "legendary sanctuary" where adventurers and monsters from all over the world gather. Enjoy the slow-paced life of the strongest old knight at the hot springs, and the story of the monsters' rise to power and evolution, to the very end! Please like, subscribe, and comment! What would you choose as a reward for defeating the Demon King? The Lv999 Old Knight Who Defeated the Demon King, Lv999 Old Knight, Old Knight, Demon King Subjugation, Abandoned Hot Spring, Otherworld Hot Spring, Hot Spring Slow Life, Otherworld Slow Life, Monster Evolution, Holy Beast Evolution, Holy Beast, Divine Beast, Holy Dragon, Demon Wolf, Slime, Evolving Monster, Strongest Protagonist, Strongest Old Knight, Retirement Life, Second Life, Otherworld Story, Fantasy Story, Narou-kei, Let's Become a Novelist, Otherworld Anime, Fantasy Anime, Light Novel, Light Novel, Manga Video, Anime Video, Reading Aloud, Story Reading Aloud, Original Story, Rise to Power, Cheat Abilities, Hot Spring Management, Ruin Restoration, Monster Training, Healing Type, Old Man Protagonist, Elderly Protagonist, Unrivaled, Otherworld Unrivaled, Sanctuary, Adventure Fantasy,