My Monster Secret, known in Japan as , is a Japanese manga series written and illustrated by Eiji Masuda. It was serialized in Akita Shoten's shōnen manga magazine Weekly Shōnen Champion from January 31, 2013 to February 16, 2017. Akita Shoten collected the series in 22 tankōbon volumes.
An anime television series adaptation ran from July to September 2015. AnimeLab has secured streaming rights in Australia and New Zealand.
Seven Seas Entertainment acquired the rights to translate and distribute the manga for North America, with the first volume being released in January 2016.
Plot
Asahi Kuromine, a normal high school student who supposedly cannot keep a secret, finds his demeanor quickly challenged when he spots his classmate and crush, Youko Shiragami, unfurling a large pair of wings from her back when he tries to propose. He learns Youko is a vampire, and she is only able to attend a normal school on one condition: no one must discover her true identity. This secret becomes difficult to maintain, as Youko herself is an airhead and Asahi's childhood friend Mikan keeps bullying the two of them. Love is blooming between Asahi and Youko but things are not very easy. Later on, Asahi discovers more girls in his school with secrets of their own: a tiny alien who rides a human-sized exoskeleton of herself, a werewolf capable of switching gender at any depiction of a moon, a thousand-year-old demon who secretly runs the school, and more who not only pose a challenge as Asahi tries to maintain Youko's secret, but also secretly like Asahi and despise the idea of Asahi and Youko being a couple, thus trying to separate them.
Characters
Asahi is a second year high school student who seemingly cannot keep a secret, so much his nickname is "leaky basket." He discovers his current crush, Youko, is a vampire when he finds her unfurling her wings after school. As a result, he is forced to keep her secret, lest she have to drop out of both school and his life. He comes to learn secrets about his other classmates and finds the people around him are not who they seem to be. Often forced to play the straight man in increasingly absurd situations, Asahi often acts as the narrator through his inner monologues. He is also susceptible to projectile nosebleeds when confronted with perverse situations, earning the nickname "Eromine" from Youko. Asahi has a younger sister named Mei, though she is barely mentioned in the story until much later on. As the series progresses, Asahi and Youko begin dating, eventually becoming a couple.
Youko is a classmate of Asahi and the daughter of a human and a vampire. Though she has long canine teeth, many other typical vampiric characteristics are downplayed, such as only getting tanned in sunlight or feeling guilty when entering a room uninvited. She has a Kansai accent, but speaks in honorifics so as not to expose her teeth. While initially coming across as haughty, her true personality is bubbly and absent minded. Her dream is to become a cool beauty, but has yet to accomplish this goal. Though initially friendly with Asahi, she develops romantic feelings for him, but keeps them to herself because she believes Asahi likes Aizawa. She is also often hungry, due to not being able to eat lunch for fear of revealing her teeth. As the series progresses, Asahi and Youko begin dating, and accidentally becomes pregnant with Asahi's child after regularly sucking his blood, unaware a vampire sucking a person's blood has the same effect as sexual intercourse.