Both stories take place in high school, both of them have a mystery and a murderer. Please keep in mind that Death Bell is more brutal then 4th Period.
Both involve high school students solving a murder case, although goth has a more deeper, psychological underline feel than 4th Period.
Even though Death Bell maybe more on the horror side...they both take place in a school, trying to solve the case with someone or something killing students.
They both have the mystery genre. The main characters are students & there is romance between the leads. The romance is subtle though.