This is one of the best chapters that has come out this year, we finally got a better explanation about the waves but are still left in the unknown as of what they actually are, finally we get a proper reasoning on why Glass and her gang are doing this and why they sided with Naofumi when fighting Kyo (I think it has been explained before, I'm not too sure tho).
The meeting also reminded us of Naofumi's lingering distrust of other people and the lack naivety present in him because of what he experienced, while on the other hand the naivety of the other heroes are at an all time high and should be touched upon if Naofumi returns to the world he got summoned to.
At last I love how Naofumi started comparing himself to Kizuna at the end when seeing the house and the painting, he also yearns for having proper friends and wonders if he's jealous of Kizuna because of the difference between the two of them.
all in all I would give this chapter a solid 9/10, next chapter which being chapter 70 is what I'm really excited for as a Light Novel reader.