The last volume was a wild ride! Wow!
I'm a bit confused about the last pages though. When Imamura literally jumped Usami from the stairs, what did he mean by "Again one more time!"? And why did it cut to 2014 immediately? Which timeline is that 2014 Usami from? Why did the story jump back there? Wouldn't preventing the first "again" cancel out the whole story?
Also, who knocked up Usami in her nightmare? How did she manage to get back?
Anyway, I enjoyed reading this manga. It made me cry a few times.