Japanese: 【東方】血迷い系巫女ハー漫画【三次創作】
Pixiv #19568920

A shoujo manga-style webcomic by Sasahara_Kaki.
This story is based on ”巫女さんとハーフ君 (A Miko and A Half-Youkai)”, a series of fanfic novels written by Hato_(NobleNova). This popular series features Miko-san (Hakurei Miko) and Half-(Youkai)-kun (young Rinnosuke).
Pixiv has some other posts related to the stories.

See also

• TOC page in Hato's website: http://noblenova.blog62.fc2.com/blog-entry-19.html#more
• List of characters: http://noblenova.blog62.fc2.com/blog-entry-115.html
• Pixiv tag search 巫女ハー