This review comes from the perspective of someone who has completed the manga so keep that in mind. Mask Danshi, as an OVA, is short and fast-paced; it is not a slow burn and not for everyone even if you are a regular consumer of the BL genre. The animation quality is average and pacing is unimpressive, the only part that particularly stands out is the voice acting which is to be expected of a rather star-studded cast. This OVA works well as an introduction to the Mask Danshi manga. If you're looking to invest time into reading the 40 or so chapters and want toknow it it'd be your thing or not then I would recommend this. If you have no intention of reading it afterwards then you might find this a bit of an underwhelming watch. If you are unfamiliar with Mitsuru Sango's work as a whole then be warned that their work nearly always involves some sort of erotic oral fixation with dubious consent so if that's something you're concerned about, I advise you to follow DLDR etiquette.