The mother of Hachikuji Mayoi. Initially, she and Hachikuji's father had true love for each other, though it later died out when they got married, resulting in a short lived marriage. They remained other the same roof for a year until she left, but had to agree to never seeing Hachikuji again. 

Later, Hachikuji runs away on Mothers Day to see her mother once again, but unfortunately fails after the tragic accident. After the accident, her mother moves away, resulting in an empty plot of land where her residence was. ~!In Kabuki, Hachikuji does meet her mother again and the two have a heartfelt reunion.!~

Second season of the Monogatari Series, part 1/2. Contains the arcs Tsubasa Tiger, Mayoi Jiangshi, Nadeko Medusa, Shinobu Time, and Hitagi End, from the Nekomonogatari White, Kabukimonogatari, Otorimonogatari, Onimonogatari and Koimonogatari light novels, respectively.
 
These stories take place after the end of the summer vacation when the apparition of the bee had left and the apparition of the phoenix avoided any consequences… Now that Koyomi Araragi and the girls were entering their new school terms, they were once again about to encounter supernatural beings…but this time, they may not be so easy to deal with.
 
Tsubasa Hanekawa, Mayoi Hachikuji, Nadeko Sengoku, Shinobu Oshino, and finally Hitagi Senjougahara. The girls’ loneliness, their confessions, and their departures… 5 new “stories” begin now.
 
(Source: Aniplex) 
 
Notes:
 
 Includes 3 recap episodes from the TV version (Ep. 6, 11, 16).
 
The recap episodes were not included in the Blu-Ray version of the anime.

How far does one go to help a lost child? In the case of returning narrator Araragi, the answer is too far, across the veil of time. Dutifully (if unknowingly) following up on Hachikuji’s cheeky foreshadowing, he concerns himself with his young lady friend and her fate in this instalment of the cult-hit series, heroically unable, once again, to find his own way home.
 
Thus the tale is also, or more so, about the journey itself, the dark honeymoon of a trip he takes into the past with the dweller in his shadow, Shinobu. Even among a cast that routinely disrespects chronology with their meta-commentary, she takes the cake, or the doughnut, by rewinding the clock for a perverse road movie, one that by and large goes nowhere, spatially.
 
It’s Kabuki not as in the theatre, but with the character for “tilt”—as in a slanted attitude toward the world, the posture of a bohemian. Or, perhaps, of a legendary vampire who once sought death, and of a high school senior who once tuned out life doing their dandy best to attend to an embarrassing wealth of aberrations in a provincial town.
 
(Source: Kodansha USA)

Tsunade