Kotsuga as she appears in the BLK artbook.

Bone Sprout (骨芽 Kotsuga) is a character created by huke. She does not appear in the OVA.


She appears to be a teenage girl with long black hair and pinkish red eyes. She wears what looks like a black seifuku. Most unusual about her appearance is her right arm appears to split into three black skeletal arms that end in clawed hands. Her other arm is normal and she wears a single black glove.


  • In huke's Black★Rock Shooter artwork, she is one of two characters whose name is not written on the page. However, on huke's pixiv her image is titled 【骨芽】.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.