This was really cute! Very nice art, and very nice presentation. The production on the intro is really high, and it is fantastic!
SPOILERS
I'm gonna start with the intro, the cute story at the start, the snow animation, the credits, and then the super-energetic intro and logo. While yes, it clashes a bit with the mood of the story, it does feel like I'm watching a TV show and that's amazing. Just with that you got a very nice hook at hand.Add to that the premise and title. Oh my god, marketing will not be a problem for your projects, they sell themselves with stuff like this.
Finally, the story and the writing was pretty good and engaging. I do want to see what more we will see of this project.
As some may say, old man yaoi indeed.