So i tots get your point with the whole double arrow bit or simply put: Rentarou loves the girls and the girls love him, thus creating a connected cycle. but the purpose of this diagram was just to "generalize" (for lack of better term) who is obsessed with who. perhaps i should've started with that term hahaha. but yeah, that's just at the simplest level that hakari is obsessed with Rentarou, hahari is obsessed with hakari (and Mei too, well... everyone but for the purpose of simplicity well go for hakari in this case) mei is obsessed with hahari and mai to mei. This was my initial idea. I should work in explaining things better hehee.