Mugen Sekai no Amadeus

Mugen Sekai no Amadeus (無限世界のアマデウス) is a manga series by Kenji Saitou with illustrations by Hougu Souji. It is serialized in Shounen Magazine R.

Plot
Story takes place in a world that is gradually decaying because of the approach of an "evil god" from another dimension. Seishirou Shikizaki meets Ajisai Misaki at a party before school starts, and the meeting feels predestined...