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A teen boy that fell in love with a girl in a dungeon. He starts out weak but as the story progresses he gets stronger.

In the year 2022, the gaming industry has reached a new height after the development of the NerveGear, a helmet-like controller that allows the user to fully dive their senses into the world of virtual reality. After a closed beta with only 1,000 testers, the Virtual Reality MMORPG Sword Art Online is launched.

My Little Monster focuses on the relationship between Shizuku Mizutani, who has absolutely no interests except in studying and her plans for the future, and a boy named Haru Yoshida, who sits next to Shizuku in class but rarely attends school. After Shizuku is tasked with delivering class printouts to Haru's home, she meets Haru, who immediately greets her as a friend, starting their new relationship.

Devil King Sadao is only one step away from conquering the world when he is beaten by Hero Emilia and forced to drift to the other world: modern-day Tokyo. As "conquering the world" are the only skills the Devil King possesses—and are obviously unnecessary in his new situation—he must work as a freeter to pay for his living expenses!

The story revolves around Rin Okumura, a teenager possessing abnormal strength and endurance who, along with his younger twin brother Yukio, was raised by Father Shiro Fujimoto. Soon after Yukio departs to study at the prestigious True Cross Academy, Rin learns that he is the son of Satan, the strongest of all demons.