FanficRecs slain's review
It's one of the few fanfics that actually goes into the "shrine" part of "shrine maiden," and Reimu herself has practically taken a whole 180 from what she is generally depicted as in fiction. Just going into the main story, late in the game, there's a huge battle between most of Gensokyo and the machinations of a certain Yukari Yakumo that is a gigantically epic scale. If anything, though, I recommend it solely on the basis that it's just plain awesome (if slightly hard to read due to the formatting), and cuts almost everyone in a different light. Sadly, it's still not complete yet, but with the amount of Crowning Moment Of Awesome moments flying around, I'm not complaining. Hell, even EX-Rumia joins in on the fun. IIRC, both the prequel and sequel are in progress.
FanficRecs totlmsr's review
Seconded. Reimu holds her light to the "shrine maiden" actions, but it's well worth a read as an AU-like atmosphere. The idea behind the fic is whether Reimu should act like a proper shrine maiden, but it gets to where Reimu becomes self-sacrificial during the middle of heated battles, like those with Yakumo and Remilia while her shouting out The Power Of Love during these battles. Moments in the spotlight for the other characters, like Sanae and Hong Meiling, are very well done in this fic.