My Love Story with Yamada-kun at Lv999
It's Almost Time For the Boss to Spawn so...
S1 E2:
Akane attends the FOS offline event and finds YAMADA there. However, she also runs into her ex (along with his new girlfriend) and blurts out that Yamada is her new boyfriend. To make amends, she takes him to an izakaya where she gets completely wasted.