Protip: After you complete Chapter 17, DO NOT PROGRESS TO CHAPTER 18 and DO THE FULL INNER NAYOS META.
That meta is the narrative bridge between the events in Chapter 17 and 18 and the game makes no real effort to convey this to the player in any capacity. The meta explains why certain characters are present in Chapter 18 and provides context for the final fight.
Though at the same time it completely, totally undermines one of the scenes during Chapter 18 where the characters express shock over some news that really shouldn't be remotely surprising given what we just did during the 3rd part of the meta.
And minor spoiler gripe The power of friendship saves the day again! Isgarren coming in like Tuxedo Mask to do basically nothing but win the day! With our powers combined, we're stronger! I'm tired of this being the conclusion to narrative arcs. They've done this too many times.