A group of live action roleplayers accidentally summon a succubus demon from the underworld.

"Only, the thing is, there's no chance of us sort of accidentally summoning the dragon here, is there?"

He also picked up the Rule Fragment that Ryner discarded after accidentally summoning a dragon from it.

Baldanders is an armored hellhound, summoned accidentally by Feli.

During an incident on his retake summoning test he accidentally summoned Tanarotte.

The men explain that they wish to experiment calling the power that the three of them summoned accidentally in The Lunatic Cafe.

He has a son who Beginner accidentally summoned when the Snow Ram was causing a blizzard when it wasn't winter.

Keita accidentally summoned her from a box he was forced to buy from Natsuki.

He is a human teenager who accidentally summoned Maki.

She is trained by Gyubid to become a black witch after accidentally summoning her while trying to summon Cupid with a stuffy nose.