So... That chapter is suggesting her sister lost at Rock, Paper, Scissors and had to run out to the store for mom and THAT is when she died? Not that it is in any way Touko's responsibility, but I can see how it would be a weight on her...
Meanwhile, I get the feeling that Touko is misreading the real reason that Yuu pulled away from her during this chapter. I don't think it is because she was uncomfortable with what Touko did and wants to put distance between them. On the contrary... I think Yuu had an uncomfortable amount of heart palpitations and got a bit too hot and bothered by her most recent make-out session with Touko, and is starting to get a little hot under the collar when they get close to each other, which she still is not recognizing as her demonstrating sexual and perhaps romantic attraction to her gorgeous sempai... poor girl.
I completely agree. a lot of the problems from here on out are gonna stem from a lack of communication. woo
Ahhh the good ol' misunderstandings, was waiting for them to play their part.
Seriously though I've never felt so bad for the broken corner of a love triangle? Like fucking Sayaka poor her they better introduce a character she can end up with...