The head of a boy with a healthy body is unhealthy. How about a girl? A fairly different romantic comedy by the author of "Manga Science" and "Uchuu Kazoku Carlvinson" that starts from a junior high school library and then goes to space?
Reproductive Monument has finished publishing and it has 10 Chapters. It is also Known as: 生殖の碑, Seishoku no Ishibumi
Genres: Comedy , Romance , School Life , Humanoid Alien , Alien , Science Fiction
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Top 5 Manga Like Reproductive Monument (Seishoku no Ishibumi) [2026 List]
5. Boku to Uchuujin
Manabu is a 3rd year middle schooler and former student council president. Suddenly he's in charge of a new student Rui but she is no ordinary girl—she's an alien! Manabu loses the chance to be with his crush Mizuho who now has a thing for Rui and gets nose bleeds from her cuteness. The teacher is of no help, her focus and nose bleeds are on Rui's hot cousin who is also an alien!
The new 2nd year student council body also plays a role in the story. The student president Hikaru is short and hot tempered, he is dating the vice president Nozomi who is tall and gorgeous. The treasurer Kazuma is a good looking guy with a great voice, yet he wears a mask and is madly in love with the cute guy secretary named Tooru!
There is another side story BL with Kazuma and Tooru—Kazuma is slowly wearing Tooru down with his love!
Boku to Uchuujin has finished publishing and it has 33 Chapters. It is also Known as: 僕と宇宙人, Me and an Alien
4. Tsukiiro no Invader
The astronomical event "Apple Moon" occurs once every 300 years. On that day, Sakuma, while visiting the ocean with his classmate to observe the event, ends up meeting a parasitic alien instead...?
Moonlike Invader has finished publishing and it has 12 Chapters. It is also Known as: 月色のインベーダー, Tsukiiro no Invader
3. Uchuujin no Kakushigoto
The girl I fell in love with is... an alien!? I, the class president, happened to fall in love with my classmate, the eccentric Haru. I confessed my feelings, but her true identity was an extraterrestrial who came to Earth to survey it. Telling her "I still like you!," I started going out with Haru, but now I have further "secrets" to keep...
Uchuujin no Kakushigoto has finished publishing and it has 23 Chapters. It is also Known as: 宇宙人のかくしごと, Secret of the Alien, Extraterrestrial Secrets
2. Sundome!! Milky Way
Sakura Yoshitake is a 25-year-old salaryman working for a food production firm. One day he takes the day off to go to his grandma's 88th birthday. While driving home after the party he sees a UFO and crashes. He survives the wreck and finds a terrifying alien standing over him. He passes out and when he comes to, he is in his own bed in his own apartment, covered in bandages. Even more, he finds a beautiful blonde half naked sleeping next to him. When she awakes she tells him she has come to earth to be impregnated by him. However when he touches her, her embarrassment causes her to lose control and she turns back into the terrifying alien he saw before. How will he ever impregnate her if she can't control her embarrassment enough to ever let him touch her?
Sundome!! Milky Way has finished publishing and it has 60 Chapters. It is also Known as: すんどめ!! ミルキーウェイ, Sundome!! Milky Way
1. Yome ga Kore na mon de.
Nobuo is an ordinary salaryman with a dark secret-his wife is an alien. Despite her tentacle hair and tendency to shoot beams from her eyes, he wouldn't trade her for anything. Love knows no bounds in this extraterrestrial romantic comedy.
Oh, My Sweet Alien has finished publishing and it has 13 Chapters. It is also Known as: ヨメがコレなもんで。, Yome ga Kore na mon de.
