S0E16 : Lite 2: An Infection Called a Stye, a Hordeolum, or Perhaps Just Beauty

In the clubroom, Yūta Togashi deals with Rikka Takanashi, who puts on a second eyepatch on her left eye after she gets infected with a stye, making her spatially blind. The other girls listen from the outside when Yūta tries to apply eye drops into Rikka's infected left eye.