Yoko Taro's writing when it comes to parallels is phenomenal and unmatched and we've seen it before (9S & A2 in N:A and Nier & Shadowlord in Replicant as two well-known examples among many) and the sun and the moon chapter is up there with them with one of the best I've ever witnessed.
something about contrasting parallels intertwining into one big climax is so special and always a recipe for something great and this act was certainly something great. firstly the overall quality and feel of this act has vastly improved from Act 1, you start to notice a lot of meta-writing choices and cooler designs and interlinking stories it just feels like much of a game rather than a lore dispensary.
genuinely no character I've seen in this act would be less than an 8/10 character if they were fleshed out in their own game or side content they're all so incredibly made. this game has many 10/10 characters that will either be lost media in the near future or (hopefully) implemented in a more streamlined way for people to experience. sun and moon, Hina and Yuzuki. I don't even know where to start with this act its just hard to find anything they missed with, overall it was very fun and impactful, everything is better than it was in act one, plot structure and pacing and music and designs even the damn cage looks incredible. the more I get deeper into reincarnation's story the more I realize it rewards you for sticking with it because it keeps showing you how truly beautiful this game is and I still have a full and final act to witness. genuinely makes me sad that not many people will experience this due to its inherent nature but oh well I'm elated to be one of the lucky few who experience this gem