Yuusha ni Zenbu Ubawareta Ore wa Yuusha no Hahaoya to Party wo Kumimashita!

Alongside his four friends, 14-year-old magic swordsman Ceres had formed a party to defeat the threatening demon king. Despite the party's smooth sailing so far, he finds himself thrown out of the party by their playboy leader, Zect, who only sees Ceres as a hindrance. Although these friends were important to him, Ceres has a secret he has never told anyone—he was a 42-year-old father from Japan in his previous life!

While visiting a slave trader for the first time, Ceres makes a shocking discovery: his first love and Zect's mother, Shizuko, is being held captive. Due to humans' short life expectancy in this world, women over the age of 20 are already seen as elderly and worthless, which allows Ceres to purchase her at a low price. Instead of treating her as a slave, he creates a party with her. Ceres is surprised to find out that Shizuko was actually a well-known adventurer alongside his other friends' mothers before getting married.

Before long, Ceres and Shizuko begin taking on various quests together and even get officially married. As their next plan is to return to their hometown, Ceres plans to fulfill his childhood desire—marrying all of his friends' mothers.