Gaki-chan is the child and animal form of Miroku Naruki. They are the manifestation of Ritsu Kanokawa's true feelings.
A youkai made by the protagonist from the heroine’s ‘true feelings’. A complete opposite of the heroine: rude, immature, and likes to play pranks on others.
Gaki-chan tends to transform into their Deer appearance at the most inconvenient of times. Although they usually lie dormant within the heroine but still appear from time to time even after the incident and tends to hang around Tsukasa.
Note: 'gaki' can also mean ‘brat’