Konomi's mother. She is friendly towards Takaki, enough to entrust him with her own daughter overnight. She often calls him over to eat breakfast or dinner with them.

Following her graduation from middle school, Konomi Yuzuhara enters the same high school as Takaaki Kono, her childhood friend. As the new school year begins, they meet their childhood friend Tamaki Kosaka, as well as many new accquaintances. Unbeknownst to the group, their encounters with each other will soon lead to many memorable adventures.
 
(Source: Anime News Network)

__Height:__ 144 cm

Chieko passed away from cancer.

The first and the second volume will feature Komaki Manaka and Kusakabe Yuuki, respectively.

According to Amazon Japan, a two-volume OVA series "ToHeart 2 Dungeon Travelers" was announced.  "ToHeart 2 Dungeon Travelers" is an RPG game on PlayStaion Portable released in 2011.

Volume 1 
Silfa the robot maid is currently working at Takaaki's house. However, she seems to have a little trouble with her duties as part of it involves going out in public to buy groceries, and she's a bit "shy" in a sense. But when it comes to Haruka Yuzuhara's special curry, she'll do what she has to in order to make this special dish for Takaaki. And that includes some competition from Milfa (Harumi). 
Volume 2 
Involves summer, swimsuits and photography. 
(Source: AniDB)