The story itself was well written and executed most of the time throughout the 12 episodes.
Taichi and Kouhei are so cute together and don't feel like monodimensional characters because their struggles and thoughts unravel throughout the story.
That said, one cannot deny that there were some issues in the story's development, one of them being the character of Maya.
Since Maya appeared, I could sense the story becoming more and more draggy as the episodes passed. Her character, to me, had little to no reason to exist or at least to behave the way it was in the series.
Another major issue was the lack of noticeable progression between the mains regarding their love. This lack of progression made the series shift more like a friendship/school-setting series than a BL with romantic attachment. And I would have been perfectly fine with that if not for the fact that I started watching this, mostly because I was intrigued by the premise of a hearing-impaired MC and his love for a boy who doesn't face the same struggles in his day-to-day life.
I liked how the production decided to represent the daily struggles of hard-to-hear individuals, both visually and with the help of sound effects - or the lack of them; therefore, help someone who doesn't have to face these difficulties like me get a better understanding of it.

I would still recommend it, but I would also suggest not having big expectations for the love progression, as this series takes a very Japanese approach.

PROS:

- A good representation of the daily life of hard-to-hear individuals, which helps the viewer get the MC's POV better;
- Both Taichi and Kouhei are such cute and precious characters. It's impossible not to like them!
- The lighthearted moments with other characters helped ease much of the draggy feeling of the overall progression between MCs;

CONS:

- Lack of progression and development of the love story;
- The ending might be dissatisfying for some viewers;
- The character of Maya fails to have a unique identity in the overall context of the story despite the potential visible in a few scenes.