These are the novel illustrations that were included in Maou na Ore to Fushihime no Yubiwa volume 3
There was a person whose smart and sharp glance matched with her glasses.
(Chapter 1 - Records of a certain summer)
(Chapter 2 - Welcome to the Underworld!)
Having lost her wings, Iris, pulled by the gravity, started to drop at a terrific speed.
(Chapter 6 - The beggining of the end)
Demon: Succubus. LV: 17
Physical strength: C, Power: C, Speed: A
Lovely female monster.
Seduces boys with its bewitching body.
It's sexual desire surpasses even that of a horse.
Reptile tribe: Basilisk. LV: 33
Physical strength: S, Power: S, Speed: A
Legendary snake monster.
Big enough to swallow a whole building.
Expels poison gas and fleeing opponents get turned into stone.