Once something happens, what the ending will be is no longer our concern. What we have to do is to interpret it completely, and this is the only thing we can do.
There's no turning back, is there?
In fact, it is about the reasoning process of an old couple to solve a crime. It can also be understood as a hole dug by oneself. No matter what, you have to jump into it. This article is about the subject, and you can experience the attributes of attack and reception by yourself. (Possibly the opposite)
In addition, this article is written in first person + third person, try not to be ridiculous. From the fourth chapter onwards, it is written in third person (the pace will slow down), so please be careful when entering the pit.