Tomobashi Kametsu

In a matriarchal world where women dominate and men are treated as lesser beings, Kureto was cast aside at birth for the sin of being born male. He scraped by as an orphan, unwanted and powerless—until the day his unique skill awakened. A "supreme virility" skill that strengthens him with every act shared with a woman. Under the guise of "training" with his dorm caretaker, Kureto masters his newfound power, achieving strength no man should possess. When he's accepted into the elite Knight Academy—a school meant for noble-born women—he sees a chance to change his fate. To become an honorable knight, to reclaim his dignity, Kureto will fight—both in the arena and between the sheets—against the very women who once looked down on him.

Uranus, the strongest great warrior, was the leader of the Hero Party which saved the world from Demon King. 300 years later, he reincarnated as Egil Schwein while keeping his previous status of 9999 strength. Deciding to become a court magician in his new life, he enrolls at the Hero Academy which was established to train the next generation of heroes. Thereupon, he gets entangled one after another with his classmates who are beautiful girls...!

The youngest A-rank adventurer, child prodigy Kaiser, finds three babies who were the only survivor of a destroyed village. Then he decided to give up his job as an adventurer and raise them. Over time, the girls grow brightly and show exceptional talents in fencing, magic and management. However, these girls also seem to love their father, Kaiser!

Sieg is an adventurer with an incredible defensive power, and he always uses himself to attract the monsters' attention to assist his teammates. However, the party leader just focused on offense without realizing Sieg's intention, so he kicked him out. After Sieg left, the team repeatedly failed multiple quests... At the same time, Sieg took the position of gatekeeper at the Royal Capital. Thanks to his defensive power, he was quickly promoted to division captain. His subordinates included a carefree big-breasted Swordswoman, a perverse freakish girl, and an Archer with an erratic temperament. He and the girls started slowly gaining the trust of people around them!

Oliver, an adventurer almost in his 40's received a certain mission in regard of his earnest personality. That mission is to bind a contract with fellow deredere little spirits who have great power or something like that!? (from Gardo Comics)