Maki is first introduced along with the other main cast after Noriko Sonozaki confronts Katsuhira Agata about the Kizna Project. Her sin is revealed to be "Pride". She, along with the other Kiznaivers are then abducted by the Gomorin and has her senses connected together. After Sonozaki leaves the newly formed Kiznaivers in the hospital, Maki is quick to separate from the group amidst the dismay caused by the Gomorin. She finds her way to the morgue where a mysterious voice calls out to her causing her to panic. After Katsuhira and Chidori Takashiro reveal their "introducti she ate dish and lesbeane on", Maki appears before the rest of them and tells hers, stating that she "killed" someone. After the events at the hospital end, Maki attempts to distance herself from the others to avoid unnecessary stress, even with the insistence of Tsuguhito Yuta. She reveals that she covered up her scar on her wrist with concealer to him when questioned. When tasked with finding Yoshiharu Hisomu, she defeatedly joins the others to assist. Maki is one of the first to come to the conclusion that Yoshiharu is a masochist, which greatly disturbs her.

Spoiler

In episode 12, it is revealed that as much as Honoka wants to deny it, she has become friends with all of the Kiznaivers. After the whole incident, she is shown having food with Yuta, eating one bite then offering it to him. When Yuta questions as to why she did that, she says that she wants him to get fat so people will not follow him everywhere because of his good looks. Yuta gets flustered because this shows that Honoka is interested in Yuta and that she is finally moving on from Ruru.

(Source: Kiznaiver Wikia)