Rena Kariu

Rena Kariu (狩生 玲奈, Kariu Rena), later Rena Ōga (大神 玲奈 Ōga Rena) in Vol.15 Chapter 222.5, is Arata Kaizaki's classmate who sits beside him after he became a teenager, a member of the girls volleyball club at Aoba High School and the girlfriend of Kazuomi Ōga who later becomes his wife at the end of the manga.