Minatozaki Sana was blind when she was still a child and her parents died in an unfortunate event leaving her alone. She lives alone and is only receiving pensions from her parents' as a beneficiary. Technically, she's not worried about money. But little did she know that for her everyday life to work, she needs constant aid and protection from harm. This is where Tzuyu comes in.

Chou Tzuyu, the girl who lives next to Sana's condo unit, and had a crush on her ever since they moved in five years ago. The problem is, Tzuyu is mute and she has ever been after a side effect of medicine she took when she was having a high fever as a child. 

For Tzuyu to talk to Sana, she needs to do a sign language but Sana is blind. And for Sana to know who she was talking, Tzuyu needs to talk, but she's mute.

Can they ever find the connection they both need when the most important communication between them is not bestowed upon them?

Let's find out.