I Tried to Prove that You Are Fine Just as You Are (S02E12)

After Kanade turns down Shikijou's love confession, he insists on knowing why, gripping her arm and exclaiming, "This isn't like you." Reflexively, Kanade shoves him away, which sends Shikijou into a furious rage, and he brandishes a stun gun at her! When Kanade finally regains her senses, she finds herself in a dark, abandoned warehouse surrounded by a group of rowdy delinquents. Bound with ropes, she’s unable to escape. Shikijou approaches her, declaring, "Kanade-san, you're not yourself right now. We need to change that."