I have some theories myself but im not typing allat so im just gonna lowkirkgenuenly connect both of our theory.
I think the loop happened because Sae forcefully wakes Ena
Theres actually more but i forgot
Ik I'm late, but the creator creates a lot of Yuri I think(?) I read a yuri from the creator and the creator definitely makes this a yuri (sorry for bad explanation, english isn't my first language)