Bouken shinai Watashi no Isekai Manual

Open the apartment door, and you're in another world!? "Huh?"

Sara, an ordinary college student, opens her home door as usual, without a second thought. However, what awaits isn't her familiar daily life but a desolate riverbank in an "other world" where never-before-seen monsters roam. All that remains for her is a mysterious notebook titled "Isekai Manual."

(Source: Hifumi Shobo, translated)