There are as many girlfriends as there are options - Parallel World (Multiverse) x Mary Tachibana, Part 4. Mary has given up on her dream of becoming a novelist, but she writes novels while working as a health teacher. One day, while living as a kind and popular teacher with the students, she helps a student who is being bullied. With Mary's advice, the student grows, and as she is single and has an abundant sexual desire, she finally crosses the line with the student. The kind and embracing teacher and the student who relies on her are attracted to each other and have sex repeatedly, but they are discovered by the head of the grade...