Note that these are taken from a slide show from seiga.nicovideo.jp (account required).

Since this is taken from a slide show, some speech bubbles appear multiple times in duplicate panels. For these I'd recommend just translating the page which contains every speech bubble, if you are going to.

If you can, please feel free to improve/complete the translations.

Manga summary of episode 1 (1st 5 chapters):
Shimura Kyuuchi, a high school boy, gets hit by a truck while trying to save a cat and wakes up in a dangerous world, in the body of a desperate girl.