Dusk Diver 2

Story-related and cannot be missed.

Chapter Unlocks: New items in Tumaz Mart Secret Store (Medium-level items).
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This trophy is for completing Chapter 5, "Back to the Backyard", and you'll get it once you return to the store from the Beimen Passage. Several important things happen or unlock in this Chapter.

Firstly, a TON of side quests unlock in this Chapter, and as usual, it's highly recommended you take care of those first, before completing the main story's quest. Included in these are Leo's and Le Viada's Companion Quests. Completing these will unlock a new equippable Special Attack for Yumo (her  move).

Secondly, when you enter Ximending's MRT Station for the first time this Chapter, you'll run into Yawen. This meeting finally unlocks the second major collectible of the game: Yawen's Outfit Design Pages. There are 61 in total, and you'll need to collect all of them. (See Fashionista  to learn more.) Like the other collectibles, this one also has a Collection Quest called (predictably) "Yawen's Outfit Designs". You don't get anything for completing it, but the good thing about it is that you can track both the Outfits you've found and the ones you've purchased by looking at the Quest details in the Menu.

Lastly, as part of unlocking the Outfit Designs, you now unlock complete free exploration. You can take a little time off from quests and revisit past areas to collect the Shards and Outfits that have now appeared in almost every Youshanding location.

As for the main quest, you'll visit another new location, this time the Beimen Passage. At the end, you'll face another mini-boss type of boss; more of an elite mob than a true boss, called the "Fusion Chaos Beast Type A". Main quest-wise, this is a very short Chapter. You'll likely spend the majority of your time in this Chapter doing side quests and exploring for collectibles.