Damn! This is really a great anime. This shows us the school romance and the character-building in a tremendous way. I like the spicy scenes between Hori and Miyamura. The manga is also very spicy, though they can show some more spicy scenes between the two in the anime adaptation, but the anime is worth watching if you like romantic, high school, and friend's stuff. The friendship shown in this anime is way great. I would like to see some OVAs of this, showing manga scenes of both.
Highly recommended to watch this wholesome anime.
Also if you like more of Horimiya, then you can read manga, they are also amazing.
Have fun!!