Abaka Baba Is 28 and a Hero

On this fantastical RPG continent, there is a legendary figure among legends: the female hero Abakababa. After the hero and her party defeat the Demon King and the forces of darkness from the abyss, they return to the imperial palace, where the legendary party is destroyed. The only hero to escape the very humans she once protected is the hero herself. Ten years later, the hero, now 28 and missing for a decade, reappears. She goes to the demon realm, gathers a force of monsters, and decides to give up and wipe out humanity. "I've realized that being a hero has its limits, so I'm done being a hero!!" The party includes a prince of the goblin race, who lives in a goblin cave; a plant mage of the humanoid plant race, who likes to rob passersby on busy roads; and a warrior of the beastfolk, a fluffy creature who fears humans and is feared by them. The three races have one thing in common: humans have smeared their reputations! Along with the hero, who is wanted by humans, they form a ridiculously bare-bones world-destroying party. Hero: "The four of us can still wipe out humanity. Hey, you, goblin, defeat the Demon King a hundred times first to grind some experience and level up." Goblin Prince: "Your Excellency, Hero..." "Oh! The goblin's talking to me! I'm going to get knocked out and dragged into a goblin cave! They're going to do all sorts of things to me! What, are the plant monster and the beastfolk coming too? Gee, why aren't any of you laughing? Wasn't my joke funny?" What kind of hellish joke is that? I really want to hit her, but I can't win!! No-coupling story, but the heroine has someone she likes. Her relationships with everyone else are friendships. The heroine is the strongest, the ceiling of combat power. Theme: Hold on to hope