Ritsuko Sakakibara

Yōsuke Sakakibara mentions that Ritsuko is a very special lady who has a great taste in men and is also a supportive sister. Reiko Mikami mentions that when Ryōhei Mikami (Reiko's father) went against Reiko's decision to attend art university, Ritsuko was the only one who stood up for her and supported her. Also, in the manga, in Another 0 chapters, Ritsuko is shown as a kind-hearted, calm, and peaceful woman as she says that she will protect her younger sister after Reiko yelled at her. Reiko claimed that she admired Ritsuko the most, and she was her idol. Also, she was very happy when Ritsuko came to Yomiyama to give birth to Kōichi Sakakibara. Ritsuko was shown to be a loving and caring person.

Adult Ritsuko in the manga. thumb|left|Picture of her seen at the start of the film. Ritsuko has long brown hair and brown eyes (black eyes in the manga). In her middle school days, she wears a ponytail in the anime, whereas in the manga, her hair is shoulder-length and worn down. Also, she is seen after Kōichi Sakakibara's birth in the manga, wearing her hair tied in a pigtail.