Well he did have that vibe. A shame since the relationships were just strained rather than broken. The title saying epilogue keeps throwing me off too.
What's with her and falling to almost her death? Besides that, I still can't place an opinion on Robia but i guess its slightly warmer? Brownie points for figuring out the big thing.
I'm very interested in what the author wants to do with Ettsen. He seems really torn about her and her distancing herself from him is making it worse it seems. Her harem is really really complicated.
If I ignore how much they bring up the age gap, I can totally see him being older than he actually is. Maybe it's the art style or that he's kinda tall compared to her, but he definitely acts older for a 17-year-old. These are the gap moe situations right? I hope they can resolve this soon.