I read Vol 3 of this series earlier this year, so was pleased to see the initial books in the library so as to get the back story.
These are middle-grade GNs with no supernatural element, the ghost motif being a metaphor for teenage anxiety, depression and alienation. The characters struggle with self-esteem, but gradually, and with setbacks and comebacks, they begin to be able to support each other and feel greater self-acceptance. 4💖