Season 1

Prologue

Val absorbed another demon for the first time.
Marc carried fainted Val home. Means Marc should know something ought to have happened, but unknown if he reported to Aria or not after that.
Val thought that he feels familiar with something and he missed it a lot.
But, it's unknown if it's the feeling after he absorbed demon energy, Mammon's presence, or Marc's, or maybe just demon's.

Aria described biology teacher with "fierce".
Aria pointed out that Marc is looking to her and Val's way.
Maybe she's realizing Marc was looking at Val and wondering why Marc did that, or maybe she tried to make Val showing any reaction so she'll know if Val really a demon or not. And since Aria mentioned about Val didn't come to the choir club, maybe she's the one who ordered Marc to find Val.
As Val was in choir club, he at least must have a decent singing voice.
Gremory got grumpy because Belial rejected their engagement.
Berith showed playing with cats.
The biology teacher was showing up again, introducing Gramory as the new student in Val class, so maybe he's Val's class homeroom teacher.

Val said that Gremory has a weird name.
Jin said to not affected by Gremory's magic because he's with Val. Maybe Jay was too at the first, but he got affected since Val always with Jin.
Marc showed stand by the school's gate in the evening after school ended, staring at Val. It's kind of weird since he supposed to do his work (disguise). Maybe he's watching Val because he felt Val is not an ordinary student. Or maybe he's waiting for Gremory and watching her as Aria told him to.

Jin was living on the 20^th floor.
Jin called Val when he's reading a book, but Val told him that he's not busy.
Maybe, Val had an interest in books reading, or maybe he just studying for a test.
Val showed to love games a lot until he's running to Jin's house to play Tekken 7, but he still can't beat Jin.
Jin seems to like playing games a lot and has good arms for games.

Val was bribed by Jin with WcD's happy meal since the packaging has Minion on them.
Val cursed on Jin because Jin beat him on Tekken 7 while he was sleepy.
He cursed "Si Kampret."
According to Gremory, Jin had sleeping habits, not an early bird, likes Korean drama, likes 2NE1, plays Killstreak, and act spoiled with his mom a lot.
Gremory accused Val targeted Jin to and wanted to take Jin away from her.

Val survived after fell off from 20th floor.
Val remembered how he survived from a car crash—or it can be called truck crash—while he was chasing a cat when he was a child.

It was shown that Marc wanted to say something to Val but interrupted when Aria was calling him to help her.
Jay was playing the same game with Jin.
Aria can't put on bandage properly.