Thank you.
Because I didn't want to do a VN, I wanted to do something from the beginning.
UNITY gives you the opportunity to write all the code and all the algorithms yourself and that was interesting to me.
It was also possible not to use UNITY and write everything in QT, for example. But I was interested to understand the features of the engine.
In other words, VN is not a goal, but a means to achieve another goal.
And after I may finish this project, I will be able to do something more than VN.