Batsu 4 Musou: Suterare Maou, Fukuen Harem Tsukurimasu.
The Undefeated Demon Lord Makes a Harem with his 4 Ex-Wives·バツ4無双～捨てられ魔王、復縁ハーレム作ります。
A powerful demon lord named Zeon is abandoned by all four of his wives after neglecting them for work. At the same time, a female hero named Alexia attempts to seize his castle. Rather than attacking him, she listens as he expresses his concerns. Before parting, Zeon mentions that his ex-wives criticized his kissing skills, prompting Alexia to suggest a kiss to test his claim. This encounter marks the beginning of Zeon's effort to mend his relationships with his former wives, now aided by the hero.