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They'll add FiveseveN in some day!

What did you do? I have no idea if the girl you get in chapter 2 is actually any good. There's also some other welfare supports you can get but she's just the earliest one if you need to fill in the team slot. Which, for the early stages it does feel like you could just go all in on DPS and still clear the stages easily.
Yeah, the one that looks like Lumine is a purple, who is different from the gold one.