She was originally a single mother. Before the remarriage to her current husband, she has been living in poverty like the Uesugi Family.
As a teacher, Rena was an incredibly beautiful woman that her beauty charmed every male students and female students. She has light-colored or dark-colored hair that is swept to the right and light-colored or dark-colored eyes.
Rena is known to be a very unsociable and serious person, especially when it comes to teaching her students, but she was also very forgiving and for that (as well as her appearance), she was adored by her students and there was a student fan club dedicated to worship her.
Itsuki was definitely close to Rena as Itsuki would go to her mother's grave on the 14th of every month. She would also act as a role model for Itsuki, who listens to her words, especially when it came to choosing men. Due to this, Itsuki now aspires to become a teacher just as her mother once was.
- Rena passed away five years prior to the beginning of the series on August 14.
- It is unknown how Rena died or what the cause of her death is.