Ability Costume Drafter In anime world.

In the world of strong, he was summoned but was left alone.
Follow the story of the boy who was summoned.
Do you think he was summoned in some fantasy world or something, but in truth he was summoned in a modern world, where demons, devil, ghost, gods, magician ran rampant and with his trial which began at age of 12 watches how Landam create his own history.

The world contains DxD, Many other anime elements I don't recall the name of and will be enjoyable since Mc is not Op and is a badass character than the novel hero with some psychology dense characteristics.
I don't have a very long writing experience so don't expect much and English is not my first tongue so don't bother telling me it's wrongly written like grammar and all.