Episode 2: Clain running to get Nessa back, only for her to meet up half way. She then jumps into his arms and welcomes him back.
Episode 5: Phryne and Nessa "making up" via a game of hide-and-seek near the end of the episode.
The group picture. D'aww.
In particular Takami bringing along the picture of Butcher
All the trio moments between Clain, Phryne, and Nessa—from Clain comforting Nessa when she fears that she will disappear to the trio simply sitting outside and watching the beautiful scenery together. Especially this scene.
Phryne: Clain... What would you wish to the day star?
Clain: I'd ask it to let me stay with everyone forever... maybe...
Nessa: Then it'll come true because Clain, Nessa, and Phryne will be together fooooreeeeveeeer!
Sunda joining Clain in rescuing Phryne, feeling it is his duty as he was the one who told Clain to protect Phryne and Nessa.
Enri reassuring Nessa that she won't disappear because she always plays hide-and-seek.
When Phryne reunites with Clain and Nessa, they are separated by a barrier-like wall and are unable to communicate with each other. Nessa takes both of their hands, and they are able to hear each other through Nessa.