Please give me the name of a novel!

When I was talking about science fiction with my classmates at dinner today, it reminded me of a novel that had a great impact on me. It also evoked memories of my youth. I want to find the name of this novel and read it again.
This novel is a short story. It's a collection of personal short stories. I can't remember the author, but it should be a collection of science fiction short stories.
The general content of the story was like this: The male protagonist was a programmer who had painstakingly written an intelligent program. One night, it was raining and thunder. The male protagonist went out to buy food. When he came back, he found that his computer could not be turned on, but there was a girl at home! This girl was the program written by the male protagonist. Because of some strange reaction from the thunder, she had transformed! Then, the male lead and the girl went to school together, ate, played basketball, and so on. Then, one day, a large-scale virus attack broke out in the world. All the computers in the world crashed. All the programs in the world failed, and all the computers were paralyzed. People found the core of the virus, but they were troubled by the fact that they no longer had the program to defeat the virus. At this moment, the female protagonist said,"I'm also a program. Let me die with the virus."
I can't explain the rest.
I know that everyone will think that this novel is very ridiculous and very chuunibyou, but when I read this novel in the fifth or sixth grade, I was really shocked! This novel brought me a lot of things. To put it simply, I felt the beauty of human love and the uniqueness of programmers. To put it simply, it directly affected my outlook on life, world, values, and love.
I hope everyone can help me find the name of this novel. Thank you!
I still remember the other novel, but I only remember a few sporadic sentences.
It was about the author's journey to the Giant Country. There seemed to be a sentence like this:
Believe it or not, they use toothbrushes the size of trees.

Answer 1

I can't answer your question directly because I don't have the book you described. However, if you can provide more information such as your favorite genre, author, etc., I can do my best to help you find relevant novels.