This was certainly an arresting first chapter. The plot hook is unique and interesting, and both protagonists are pretty compelling with fairly unusual personalities and situations. Thanks a lot for the translation!
You would think it would occur to the MC that while her life might be crappy, their worlds can't be TOO different if this lady is planning suicide.
If anything, their outlooks seem oddly similar . . . or am I the only one who found the MC's musings about escaping this terrible life vaguely suicidal?
When the MC talks about "the world of reality," I don't think she's really talking about being happy. Rereading page 7, she seems more to be contrasting people who are "beautiful and confident" with her as "worthless and alone." I think it's more to do with her jealousy of people who, unlike her, are talented and successful at achieving their dreams? She points out that Sayaka must have some strong desire (such as revenge) to want to both kill herself and have a farewell letter be read aloud at her funeral, while the MC -- despite her escapist musings -- is still stuck in the same rut she's been in for seven years.