Totally screwball (almost feel compelled to add a "supernatural" for the detailed and if-not-magic-then-totally-nonsensical glasses plot device), but ultimately adorable once it plays things out. Multiple relationships that pose ethics questions when they start, but are pretty much sorted out and wholesome-ified by their ending. Everybody's even properly paying attention to consent by the end! By the low standards of BL I'd call that a win.
Downgraded tag from yaoi to ahounen-ai because the only sex scene doesn't actually get to any dirty bits. But, it's decently raunchy in some of its bits nonetheless. I guess I'll add a smut tag to split the difference? It's vaguely deserved regardless, with such a self-indulgent premise.