Ichigo no Gakkou represents the path not taken in Sensei!. Sensei! is about what happens when a student and teacher, who really do love each other, try to keep their relationship secret until the student graduates. Ichigo no Gakkou is about what happens if that relationship gets exposed. Both are thoughtful series that approach the student-teacher relationship in a non-judgmental way, but are also fully conscious of the hardships inherent in such a relationship.
Both stories are about students who fall in love with their Sensei. In Kiss, she falls in love with her piano teacher, while in Sensei!, she falls in love with her homeroom teacher. Both are very sweet and innocent.