After normal school hours, Sensei has been called to head to the staff room. Not sure what he's supposed to be doing, he is accosted by Miku and Sana, who are supposed to be on cleaning duty but are unable to find any of the supplies they need. Sensei makes a comment about finding an actual teaches, but quickly covers his slip-up when Sana calls him on it.
The three get into a discussion which bounces around several topics in their quest to find the cleaning supplies, and durin a discussion over Miku and Sana's experiences in middle school, Sana cuts Miku off to reveal the closety, and the girls grab their supplies, Miku bidding farewell to Sensei before he leaves to go about his evening.