Tomoya Chinami features in Episode 3, "Before the Wedding Bells Ring," unfolding in an alternate reality where societal mandates compel girls to marry before turning seventeen. Engaged to Nana Nanase, a central figure in the narrative, their marriage advances until Nana realizes that adopting Tomoya's surname would rebrand her as "Nana Chokoba" (Chokoba Nana). This surname revelation triggers Nana’s reconsideration and subsequent rejection of the union, culminating in the wedding's cancellation.