Kusanagi Kei is walking along the lake one day when he notices a strange woman nearby. It turns out that the woman is an alien officer from the Galaxy Federation. The woman, Kazami Mizuho, also happens to be Kei’s homeroom teacher! The two gradually get to know each other and romance blossoms between them; however, the school principal soon finds out! Their solution: get married! The newlyweds must now keep their relationship under wraps, with Kei’s friends and the Galaxy Federation in the dark about what is happening.

Just like Nobunaga-sensei no Osanazuma, Please Teacher is also a romantic comedy featuring a romantic relationship between a student and a teacher. Both anime also add strange twists to the story; for instance, Nobunaga-sensei’s situation involves a time-travelling princess from Japan’s Sengoku Era, while Kei is romantically involved with his alien teacher.

Yaichi Kuzuryuu’s life is fairly interesting. For starters, he happens to be a shogi master – in high school! The teenager’s life takes an interesting turn when a nine-year-old girl shows up at his house requesting to become his disciple! From then on, all sorts of wacky events ensue, with Kuzuryuu’s life as a professional shogi player rumbles on.

The similarity between Ryuuou no Oshigoto! and Nobunaga-sensei lies in the student-teacher relationship existing in both shows. The difference in this particular case is the fact that there is no romantic element in Ryuuou no Oshigoto but it rather explores the student-teacher dynamic from a platonic perspective. Both deuteragonists in this case are girls who possess sharp intelligence, alongside completely changing the lives of the main characters!

Izumi Hayato is a studious high schooler with great ambitions of becoming the student council president. He has the makings of a great leader – responsible, humble and just not as good as his rival, Wakana Ui. He loses the election by a landslide and relegates himself to the Vice President role. However, things get wacky when Ui moves in with him, with both of their lives having been floated away on a drunken promise their parents made. Hayato and Ui are due to be married one day as arranged by their parents – but they must keep it a secret from everyone at school and still balance student council work with married life.

This time around, the romantic relationship is set up between characters who are the same age. The thing that places Okusama ga Seitokaichou! in the same realm as Nobunaga-sensei is the element of the arrangement of marriage. Both shows also have heavy elements of school and school life, as well as an element of professionalism evident in the lives of the main characters. Ui and Hayato have their student council work, while Nobunaga is a teacher and Kichou is an actual Sengoku princess.

Fuiji Natsuo is in the height of adolescence, with his heart fluttering and stomach knotting up for the cute girl in his class… his homeroom teacher, Hina. Perpetually suffering from the complete hopelessness of this romantic situation, Natsuo attends a mixer with his friends, to get his mind off things. He isn’t actually interested, but he meets Rui, a girl who didn’t seem interested in the mixer either. They bond a little over their shared disinterest and soon after, Rui invites Natsuo over to have sex with her, hoping that the experience will stop her friends from infantilising her. Both are dissatisfied with their first time and decide to part ways as strangers. However, Natsuo’s dad suddenly drops the bomb on his remarriage to Tachibana Tsukiko, who’s on the way to meet Natsuo. Things get wilder when her daughters, as in, Natsuo’s new sisters, turn out to be his teacher Hina and Rui, the girl to whom he lost his virginity. Natsuo must now navigate his feelings in a home situation that is anything but normal.

Domestic Girlfriends and Nobunaga-sensei share similarities in the fact that both present romance in a realm where romance is taboo. Nobunaga’s relationship with a fourteen-year-old contrasts Natsuo’s ever-deepening feelings for his teacher, and the secret he shares with Rui. In a sense, it can be said that Domestic Kanojo takes a more serious tone than Nobunaga-sensei while working with similar elements.

Satou Ichirou is your average 17-year-old high school student. However, Ichirou always seems to find himself in compromising perverted situations with his homeroom teacher Kojima Kana. With loads of high school shenanigans running in the background, we see the daily lives of Ichirou and Kana and how they handle the various hijinks that characterise their daily lives.

Nande Koko ni Sensei ga!? has the perfect title given the content of the show. With its ecchi elements, the series very much lends itself to the same league as Nobunaga-sensei. The obvious similarity between the two is the fact that both shows feature a relationship between a teacher and a youth, one which lends itself towards romance but both shows also heavily rely more on their comedic tendencies.

Saikawa Nano is a high school teacher who hasn’t really given much thought to marriage. However, her father’s friend wants her to meet his son, Takamiya Souichiro, with the intention of pairing them up. After getting to know each other, Nano and Souichiro end up hot and heavy; however, when Nano puts her glasses on, she realises it isn’t Souichiro, but one of her problem students, Kuga Souji! Souji reveals that he is Souichiro’s brother and decided to take his position in order to be with her! He also claims that his family would have no qualms, but is Nano really interested in a relationship with a student? She is unsure, but feels herself desiring him nonetheless.

Just like Nobunaga-sensei, Mondaiji follows the same pattern of having an illicit relationship between an adult and an adolescent. The focus is the age gap between them and the apparent prohibition against the type of relationship the characters are pursuing. The other similarity is the fact that both shows have an ecchi element over and above the romance.