I'm not sure if her name is supposed to be a pun of some sort...? 不知火零
不知 means not having, or not knowing. And 零 - rei, can sound like 礼 - manner. So her name can mean "lack of manners" if we ignore the 火. I don't know, this is just something I'm guessing. Maybe I'm completely off and just looking too much into this. My Japanese knowledge is still very subpar.
This is a surprisingly entertaining series. The comedic elements of the MC acting more mature than his age really make this series stand out from the many similar ones.
I like it, but we all know what is going to happen, 50 chapters of nothing, in the last one they declare themselves and it ends. Without seeing what we really wanted to see.