Well, I'm on the sixth chapter of Gisou Honey Trap but I can't finish it right now. But looking at the end of the fifth chapter, I'm going to say that the yandere may be
. I think that
is the "emotional crutch" type. But I also think that the yan quality is rather small. I was actually doubting if there was a yandere in the series at all. I'll finish it tonight when I get back home.
Edit:
I can confirm that
is a yandere. Choice of weapon?
Gisou Honey Trap: Confirmed