Hibi confessed to his high school sempai (Sugino) but was gently rejected by his feelings of love is just admiration. 5 years have passed and Hibi came back to his high school as a temporary librarian where he is reunited with Sugino who is a teacher in the school
(1-4) Kousuke is a veteran teacher while his 5 years younger lover Junta is a new teacher. However, they are fighting since Junta feels that Kousuke is looking over his shoulder as a more experienced teacher and that irritates him but It will take time for Junta to gain experience as a teacher.
5) Story about Daichi and his childhood friend Masaki. Masaki was a child in the manga Family simulation where he was looked after by his uncle.
http://www.mangago.me/read-manga/family_simulation/
Takamine and Natsume are high school teachers. Natsume was Takamine's teacher and came off as a clumsy person but he was well liked as a teacher. Takamine became a teacher so that he could be closer to Natsume.
Someya is a university student who use to have sex with his cram school teacher, uno when he was a student. Someya is in love with Uno who acts like they are just sex friends until one of them falls in love with another person. After a year, Someya appears before Uno at his cram school where Someya will start being a part time teacher.
(1-2) Souma is a script writer who is also the assistant to a popular script writer. He meets his old collage crush, Kozono, who he never confessed to. However, Kozono wants to spend more time with Souma and wants them to date.
3-4) A child daycare teacher and a nurse at the retirement home next door did not get off on the right foot since the nurse is always glaring at the teacher.
Manwha about two teachers, physics and chemistry, who are alumni of the school that they are teaching at. Lee, the physics teacher, is new at his old school where he meets the chemistry teacher, sonny, who reminds him of his first love. When lee was still a student in school he fell for a fellow student but he was half asleep so he never saw the student face. Now that Lee is back he is trying to find clues about his first love whose mannerism is similar to sonny.
Aoki is a pure hearted high school teacher who cannot handle the new school doctor, Manabu, due to the way that Manabu looks at him. There is a rumor in the school that if you go the infirmary then the doctor will help you get rid of your virginity. One day Aoki was looking for one of his students and had to consult with Manabu since his student usually spends time there and as a result, Manabu decided to play with the pure man before him.
Miraiken de Ai o Tsumugeba