The world itself was created by the powers of Issei. Issei deepened his knowledge of magic Thanks to... (Spoiler)
闇のアヴァロン (Yami no Avaron)
He has Improved ability to manipulate space. This world was also created with the help of magic of darkness and light . He used it because it was his favorite magic and because the Darkness was quite flexible in terms of shape and properties.
Issei also gave this world several nicknames such as...
World of Eternal Darkness and Peace
Shadow Realm
Vacation when I want
The world is made up of several parts.
Celestia
it's basically a palace that Issei inhabits or spends time inside. .
Forest of Light
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and
Drake's mountains
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Palace
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Throne Room
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Inside the palace
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This room is the storage for Issei, because in it he stores weapons, books, things, and so on... Library.
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In the future, I have plans for this Issei's Dimension
