There is a high-dimensional creature in the void outside of the multiverse. By chance, he found the multiverse in the three-dimensional space. He was attracted by the various parallel universes. Then he observed and recorded the multiverse. The creature established his lab in the void --【Misery Abyss】 and named himself 【Observer！ Gaster】. However, O!G quickly discovered that the multiverse isn't as beautiful as it seems. Similar low quality parallel universes increased extremely quickly like cancer cell. Seriously endangering the prosperity of the multiverse. So, his experiment had a clear goal--create an ultimate creation to purify the multiverse.