If you're looking for manga similar to Gakkou dewa Oshiete Kurenai "Sekumai" no Hanashi, you might like these titles.
Konishi Mafuyu had been diagnosed with GID (Gender Identity Disorder) and tells her real experiences on her journey to Thailand to receive a Sex Reassignment Surgery in order to become a woman in soul and body.
At age 30, Shou Arai came to a realization; they had no gender. Now they were faced with a question they'd never really considered: how to age in a society where everything is so strongly segregated between two genders?
Drawn in the style of diary comics with an upbeat, adorable flair, this is a charming tale about Chii, a woman assigned male at birth. Her story starts with her childhood and follows the ups and downs of exploring her sexuality, gender, and transition–as well as falling in love with a man who's head over heels for her. Now they want to get married, so Chii's about to embark on a new adventure: becoming a bride!
Nonbinary manga artist Poppy Pesuyama is excited when forms offer the option to choose “neither” for gender and thrilled about their new job working as an assistant for mangaka X! But then he sexually harasses them, treating them first like a girl and then like something less than human. It only lasts a few months, but in some ways it never ends. Born into a body they hate and still reeling from the abuse they faced seven years ago, Pesuyama begins to rail at their past, their friends, and even their mother as they try to come to terms with who they are and what happened to them.
An autobiographical manga that tells the story of the author's trip to Thailand in order to get a sex reassignment surgery, describing the process of becoming a female from male. But the path to womanhood is a lot more painful than imagined...
On the way home from work, male-to-female transsexual Maho meets Fujiko, the estranged daughter of a well-to-do family. After realizing they live in the same apartment and both work night shifts, the pair soon becomes inseparable, due to their mutual jaded personalities and detachment from normal society. Between drinking tea and gardening, the two women discuss gender and the frames that society imposes on people.