Three years ago, a high school boy who had been the subject of relentless bullying carried out a suicide bombing that killed all but seven of his classmates. Now the survivors have gathered to finally put an end to their own torment.

Takushi Hatsujou had played with a twin brother and sister when they were all kids, and he fell in love with the sister, culminating in his asking for her hand in marriage when they grew up, to which she agreed. However, they were torn apart for 10 years until Takushi is finally able to get his grandfather's permission to marry her. When they finally reunite, he is surprised to find they both look like girls. Although he knows one of them is cross-dressing, he can't tell which is a guy and which is a girl.

“Maou Army’s strongest magician” I’m called. Ike, a demon capable of capturing a fort alone. Clearing away enemies with immense magic, he is without a doubt a monster awed by friend and foe. However, he has a secret he can’t tell other demons. “I, actually I’m human you know.” Using modern knowledge to keep his secret, he became treated as a great commander and the driving force of the Maou’s army.

Saphate is the second son of the Greed noble family.
He hates the way his clan squeezes the money from the population and the way it wastes it and when he went to oppose his family's way of act, he's kicked out.
Although he lost his job at the Magic Academy and become a wanderer, he managed to live normally with his former elf colleague and a cat maid that worked for his family and that left her work for following him...

This is a story that narrates his everyday life.

In a world where aptitude for magic is determined by a crest. At the age of seven, Alec, the sixth prince of the sacred Luxian Empire, was given a crest of , which is said to turn him into a demon as soon as he uses it. Scorned by those around him, Alec became a shut-in in the palace, and in the last days of his life, he used , which he had never used before, in the hope of getting a good glimpse of it. However, Alec's crest was actually a special one that allowed him to use without having his body taken over by a demon! He died as he was - but when he woke up, he was back to his childhood! Reverting back to his seven-year-old self, Alec uses to turn all kinds of demons into his dependents, and together with his strongest companions, he builds an ideal country..!