Katori, Mato
Summary
Katori serves as the homeroom teacher for Class 2, Year 1 at Yumegaoka, while also taking on the roles of supervisor, adviser, and consultant for the Diving Club. She shares a passion for scuba diving with Hikari, a bond that was solidified after a competition between them upon her arrival at the school revealed their status as diving buddies. She drives a Nissan Cube mini MPV affectionately named Pokoteng 3rd-kun. There is a strong possibility that she is the same character as the older sister of Katori Senkou from the manga iRoman Club, noting that the mangaka, Amano Kozue, frequently features crossovers involving the blood relatives of main characters.
