Reading "Wisdom of Toad"

I read the Wisdom of Toad written by Ken Lamberton in English class. This is that the main character is digging at the prison to give the toad to this daughter as a present. Then my question is that why must he give the present to his daughter even though he has difficulty to find the present. Why he is in prison? The wrong thing that he did was that even though he was a teacher, I fall in love with the girl who was 14 years old.

I used "I use a dictionary to help me understand what I read" because the text contains many vocabs that I do not understand. If there are only a few words that I do not understand, I just guess but there are lots so I used this strategy. Secondly, I also used "When I read, I think about ideas and information in both English and my native language." As I said before that this is hard to understand due to the limitations of the vocabs, so I try to get idea both in English and Japanese. It helped me to understand better. Lastly, what I used was "When text becomes difficult I re-read it to increase my understanding". I think I read more than 3 time per paragraph because if I did not get the idea, I could not think deeply and hard to have my own opinions about the reading. These are three strategies that I used this time.

I was little surprised about the reason why he was in the prison. Even though it surpried me a little, I thought the reason why he is in prison was more serious because in my country, there are many incidents similar to this incident. 14 years old is not an adult but not too young. If this happens at my school, I can not trust any teachers and can not respect them because teachers have to be the models of the students. I also can not trust the writer. Can you trust the teachers who fall in love with the student?