She is a maid/housekeeper working for the Sugimoto family.  

Fumi and Akira were close childhood friends until Fumi had to move away. Ten years after losing touch with each other, the two girls meet again as high school freshmen. The two struggle to reconnect after so much has changed, and both deal with the trials and tribulations of high school &mdash; sometimes independently and sometimes with each other&rsquo;s help. 
(Source: Anime News Network)

**Height:** 155 cm

Kobayashi is a voice actress (seiyuu) currently affiliated with Kekke Corporation and was formerly part of RME.

Fumi and Akira were best friends when they were little, with Akira always looking after the crybaby Fumi, but that all ended when Fumi's family moved away. Several years later, Fumi's family returned, and she and Akira happened to bump into each other on their way to school. They became friends again, quickly slipping back into old patterns. Shortly after, Fumi began dating a cool, attractive upperclassman who, coincidentally enough, had ties to Akira's current school, the prestigious Fujigaya Girls' Academy. 
(Source: Lililicious; updated from an early misreading of the school name Fujigaya, called Fujigatani in initial translations of the first chapters)
 
Note: Includes 10 extras chapters from the volumes.

Fumi-san