Ahhhh! Why Are You Giving Me a Mess of Ambiguous Texts! Why!

I want to read a book similar to "Last Train No. 13". The protagonist can be anything, just don't be ambiguous! You can have CP, but it shouldn't be ambiguous or ambiguous in the extras. In addition, you must have the desire to read more, the content must be logical and not brainless, and the content of suspense and fantasy must be compact.