Was a Choose Your Own Adventure which is now completed. A very dark fic by Touhou standards, and very long, but well written. The setting takes on a feel of being quite dangerous, one in which almost nobody can be trusted (save for Cirno, who becomes a friend if not an outright ship). The main character is incredibly limited in what he can accomplish as an ordinary human, even when he obtains the ironically fitting power to see through others' eyes, which mostly just serves to turn his caution into inaction. Many of the mansion's mysteries and problems are never solved, and several apparent "plot hooks" are left dangling simply because he doesn't risk them (or never gets the chance to try; though a few are also dropped because the author changed his mind). Even the Q&A thread leaves many questions unanswered. Also contains pages on pages of debate by the players as they themselves try to make sense of it and make their decisions, interesting to read in its own right (though you may want to just skip between author posts instead). Sadly, thanks in part to having underestimated how deep a character the players would expect Remilia to be, it takes a turn for the Diabolus Ex Machina near the end, and has a completely inexplicable second one in the epilogue.
FanficRecs Brickman's review
Was a Choose Your Own Adventure which is now completed. A very dark fic by Touhou standards, and very long, but well written. The setting takes on a feel of being quite dangerous, one in which almost nobody can be trusted (save for Cirno, who becomes a friend if not an outright ship). The main character is incredibly limited in what he can accomplish as an ordinary human, even when he obtains the ironically fitting power to see through others' eyes, which mostly just serves to turn his caution into inaction. Many of the mansion's mysteries and problems are never solved, and several apparent "plot hooks" are left dangling simply because he doesn't risk them (or never gets the chance to try; though a few are also dropped because the author changed his mind). Even the Q&A thread leaves many questions unanswered. Also contains pages on pages of debate by the players as they themselves try to make sense of it and make their decisions, interesting to read in its own right (though you may want to just skip between author posts instead). Sadly, thanks in part to having underestimated how deep a character the players would expect Remilia to be, it takes a turn for the Diabolus Ex Machina near the end, and has a completely inexplicable second one in the epilogue.