Nakano Rena

Японское имя:	中野 零奈
Прозвище:	zero-na

The quintuplets'deceased mother. She was "a gentle and maternal female" according to Itsuki's words. During her lifetime, she was a stern and strict teacher, and she often punished her students with iron-fist sanctions. However, because of her good appearance, she was welcomed by students.

Wikipedia