OMG THE GROUP HAVING A STUDYING SLEEPOVER. Inukashi is studying to this important test so everyone come around to help her/him but in reality Nezumi teases Inukashi endlessly, Shion is in charge of making sure Nezumi
won't tease Inukashi endlessly (possibly by making out in the bathroom just saying) and Safu is the only one actually teaching Inukashi.
Oh and about the performance, Nezumi would have all these insults about Shion's performance ready for later, but when they go on stage, Shion is so good Nezumi almost forgets his lines