A lot like Muv Luv alternative. now chapter 2 will decide which direction they will use, a time travel back to prevent the disaster or just telling the story about what happen in the past and relationship development between MC and heroine
but I think it'd be the latter because Gundam Eight...
I guess from the story and her reaction when saw her boyfriend cheating she may pregnant with him, and if my interpret is right that 'blood' mean only one thing...her bond and shackle in her life already gone, she now willing to live on and move forward
FYI : you may noticed some part of the story is swiftly jump and cut off because this work is like a collab story with other manga name "Until death do us part" you will see character from both manga appear in each other story because they're both officially in the same universe now
so, to get...
I'm still reading though, but because this series went hiatus for so long and change from weekly to half a month for chapter, it's hard to get attention again