I didn’t like Season 1 as much, I think because the story was scattered around introducing so many characters. I also agree that ecchi is a turn-off for me, but I liked the concept, characters, and production value enough to stick with it.
I think the strength of the 3rd season onwards is that it relies more on the established cast, rather than introducing a ton of new characters all the time.
Yeah, the lack of emotions is definitely a defence mechanism against the traumatic memories. It’s nice that they’re exploring this topic