Tomoka Inose (猪瀬 智香, Inose Tomoka) is a waitress at Inoya Café. She attended Yomiyama North Middle School in 1983. She is the half sister of Yūya Mochizuki.

Tomoka is shown to be mature and responsible, but also good and kind towards her brother.

Tomoka has long brown hair, usually caught in a neglected ponytail, and green eyes. She wears a white shirt with a black tie, a red vest, and a black skirt, presumably the cafe's uniform. In the manga, she has long white hair tied in a ponytail and black eyes. As casual clothes, she wears a white T-shirt. The cafe's uniform consists of a white shirt with a black vest.

Tomoka made her debut in Episode 7 as a waitress at Inoya Café, where it is revealed that she is Yūya's older half-sister. She attended Yomiyama North Middle School in 1983. Although aware of the rumors about Class 3-3, Tomoka didn't believe them until her brother, who was fearing for his life, explained the situation to her. Katsumi Matsunaga is a regular customer at the cafe where she works. Tomoka helps Kōichi Sakakibara, Yūya, Naoya Teshigawara, and Izumi Akazawa to solve the mystery of 9th Grade Class 3-3 and stop the calamity, giving them details from her conversations with Katsumi, the one who stopped the calamity.