Koharubara Hiyori no Ikusei Nikki

is a Japanese light novel series written by Yusaku Igarashi, with illustrations by Aoi Nishimata. The series began publication on October 10, 2009 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"I want you to ... with my hands ... to be an" adult "..." Hiyori Koharuhara, who is 70 years old and lives in a poor apartment with a common toilet and bath. 14-year-old Nakazo) is a sober person who can be called a rare talent.

It takes at least half a year until my classmates recognize me, and if I stand in front of an automatic door, it won't open in many cases. After all, the group photo is sepia only around the weather. One day, a word suddenly came out, and Yusuke Harusaki and Hiyori's sober remodeling plan began.

That is the first step to becoming an adult woman = nurturing a young lady.