Wolf Girl and Black Prince, Vol. 9 (manga)

When Erika turns Kyoya down for a date to help one of San’s younger brothers shop for San’s birthday, Kamiya points out her story doesn’t add up. Kyoya goes into full detective mode and is shocked to find Erika meeting up with a tall and handsome stranger! Shaken to his core, Kyoya can’t even bring himself to go to school the next day. Can the pair survive this apparent betrayal?