This is good! Even if it was not yuri, I would read. And BTW, maybe I would lock a person even sooner if I knew he/she would die to unknown causes, even if I'm not in love with them. And I'm no psycho, I'm more like the overcautious hero from that one anime. We've just got to be 100% sure that nothing bad happens, am I right? (...)
Might as well bring all the antidotes to all kinds of poisons, dress her in a medieval armour, put a gas mask, and lock her movements just so she doesn't kill herself like It's seems to be happening in all timelines. It looks like the world is against her living, just like in STEINS GATE, but I might be wrong and the heroine (not the MC) is most likely the bich behind everything (tho' it's too obvious to be truth).