ドーナツホール (Donut Hole)

Background
Hachi's latest song after almost three years of absence in the VOCALOID community.

The song is about a girl who wants to remember a person, but can't. "Donut hole" is symbolism for a hole in the mind - memory loss. She can't fill up the donut hole because it's not supposed to be filled. The person she trying to remember never existed, and that's why she is not able to fill up the hole in her mind.