Honkai Fem Oc x Konosuba

Akira Himejima and Kazuma Sato were childhood friends who separated due to Akira moving, having heard of Kazuma's untimely death a year later. A month has passed after his death, while playing Honkai Impact 3rd on her computer by herself, she dies due to a thunderstorm hitting her apartment complex, unluckily or luckily she was the only one inside it at the time.

She finds herself in a void with a goddess called Eris. Eris tells Akira that Kazuma was reincarnated in another world. She chooses to help Kazuma in this new world by becoming the Ultimate Herrscher of Creation.