[SecretT]

Spoiler for my opinion,with minor spoilers:

I just read the first volume,and I agree with you- it's one of the best works I've seen,not only including light novels.
I like stories with the time-travel/time-loop theme so it got me captivated from the beginning. The mystery,characters,plot twists were all incredible. I'm definitely going to read next volumes and I suggest it to everybody.