looking for manga

[acnx365]

MC have a normal schoollife in countryside with childhoodfriend, but teacher sudden said they are going to participate in a war. Later there is a transfer student from warface. The enemies they fought is alien.

 

[Yatsuki]

@acnx365 Do you remember any other details? MC is male/female? Family situation? Were there any actual fighting with the alien or just recruitment etc? On that note, are the aliens currently known globally to everyone or suddenly they appear one day then students are asked to go to war? The transfer student is male/female? Any other events? Any extra details help.