Living In A Seemingly Familiar World With A Slime? (Dropped and Discounted)

A fifteen year old boy coming home from school goes through a series of specifically unfortunate events that lead to him dying within a matter of minutes. Granted "skills" that corresponded to his desire at the time, he died and was reincarnated.

"...An unfamiliar ceiling... No, a cave? Where is this?"

He spoke aloud, and jolted up from his laying position from the sudden feminine voice he heard at the same time, matching the words he just said.

'Did I just turn into a girl!?'

An unknown sense of relief and dread washes over him. To her, it felt like he wanted this, but also not? Why is she naked!? There is also one more question, what is this blue jelly lookin' thing crawling on her arm!?
After shaking the thing off her arm and observing it, he, now she, realized that it is a slime.
...
"A slime? It looks very familiar... But, where have I seen it before?"

(I don't own "Tensei Shitara Slime Datta Ken", the Cover Image, or any image later found in the series, the credit belongs to the original author and artists respectively. Also, this is a trial and error writing that develops as it goes along It is of course bad at the beginning but I steadily develop more skill in later chapters.)

Records:
#1 On GenderBender (Not what I was planning on, but okay...)