Well, I've just found out about the ending of this one... I can't really say if it was bad or just weird...
This plot could have been excellent, like the movie "The Butterfly Effect". And to be honest, I really thought it was going in that direction after MC's second time travel. It could have provided a lot of chapters with many situations and stories. So much wasted potential...
I still hope the author will draw more manga in the future, I really like her artstyle. Let's just hope that the plots get better.