According to GIGAZINE, a short spin-off anime of manga "Glass Mask
" was announced to be aired from April 7th. It's a 5-minute-long comedy flash anime produced by DLE
Garasu no Kamen Desuga official website
The manga author Miuchi Suzue
said she must have been exhausted and had little judgement when she approved this anime project. When she came to, the production had already been started.
Glass no Kamen Desu ga