Isekai Henshuusha: Manga de Sekai wo Sukuu Koto ni Narimashita

Synopsis

Kouki Ichinose, a boring manga editor is summoned to another world with the manuscript for the first chapter of a new series he was about to submit. After confirming that he won't be able to submit it in time, he was called "Savior-sama" by the summoner Laila...!? (Source: Shueisha, translated)