I Relied on My Girlfriend to Unlock the Mountain and Sea Illustrated Book

Also known as "My Girlfriends Are Monsters". "I am the man who wants to become the lord of monsters!" Fifteen years after being reborn in this island country where humans and monsters coexisted, when Kirizawa Takii entered this academy where humans and monsters studied together and met the descendants of the legendary great monster, the illustrated book of mountains and seas that had been silent for many years was finally opened. As long as you bond with those beautiful monster girls and steal their magic power, you can unlock the seals of the monsters in the mountain and sea illustrations. "Takii-kun, I am now the lord of monsters in the Northern Kingdom. We can finally be together!" "For Takii-san, I reluctantly became the lord of monsters in the Tokyo area!" "As long as I freeze Takii-kun, we can be together forever." Faced with these fiercely attacking monsters, how should Kirizawa Takii respond?