FINALLY after 23 chapters we found out a bit of what happened before, should really start with her not returning rental DVD on time chapter and this one since it all was out of the blue.
It's extremely rare to find a shounen story where character isn't attracted by HUGE FUCKING HONKERS, ENORMOUS HIPS AND FAT ASS but a well maintained slender figure with a shapely cheeks that are far more practical and last way longer. Truly a man of culture.
Ryo being a bit of a masochist must have fell for a harsh exterior of Rinko before, but the DVD rental moment sealed the deal.
Him loosing a job is possible, quite a lot of work don't care much about employees and will gladly fire anyone because "there's a limitless line waiting for this work", especially in retail where no experience isn't that necessary.
Rinko being "bitch" for making him loose the job is her strict attitude, but that slowly changes once they met... a bit...