At school, Aiko discovers that all the girls in her circle of friends aside from her have already had their first menstruation. After going home to her room, she reads up on menstruation and in frustration punches herself in the uterus. This seems to "awaken" Maa-chan, Aiko's anthropomorphic vagina, who begins coughing up blood. Maa-chan introduces herself and says that she's been with her ever since birth and from now on she's going to assist in her journey into adulthood. The next day at school Aiko tells her friends that she's now one of the them. Source: (MU)

It's time we got married." That's what Alexander, Loren's first love, has the audacity to say to her after stepping out of his helicopter. He is the eldest son of the legendary del Castillo family. The family rules an island kingdom in the Mediterranean, and Alex always treated Loren like a kid. He hasn't contacted her in ten years, so why is he suddenly proposing to her now?

From [MangaHelpers](https://www.mangaupdates.com/groups.html?id=1011): One sad day, Aiko finds herself working at the funeral of a boy she once liked. His wife preceded him in death, and he left behind a little boy. That little boy moves into the care of his older brother, an unkempt man that seems less than thrilled with the prospect of caring for a child. Aiko is concerned for the well-being of the kid so she inserts herself into the situation. It turns out that the child's new guardian, Karibe Kiyomi, is actually a popular mangaka. Few know this, however, because he writes his long-running shoujo manga under the pen name of "Karibe Mariko." In order to make sure the child is okay, Aiko agrees to an unusual deal with Kiyomi and his manager. She'll let them arrange her love life, in order to research situations for Kiyomi's manga. Does Aiko really understand what she's getting herself into? [tethysdust]

Momo Momose has been able see things that other people can't from a young age. Although she was supposed to lead a normal high school life, a beautiful young man dressed in Heian era clothing suddenly appeared...!? (Source: Hakusensha, translated)

Mireille, the princess of the small kingdom of Grilles, is an old maid when she suddenly receives a marriage proposal from King Cain of the great kingdom of Drake. It soon becomes clear that the woman he fell in love with at first sight is her younger sister, and that he has mistaken her for someone else. However, by order of her father, the king, she is forced to marry him in her sister's place. Mireille was prepared to bear the burden of her deception, but for some reason, she continues to be treated with care as a bride—!? (Source: Overlap, translated)

Eru is a girl, but it is actually an angel. One day, she meets Hikaru, the hero of the story. He was on his back, since his birth, mysterious holes. Their encounter will change the fate of the world.

Takeshi Harada is a 38-year-old man. Unexpectedly, he became a father of 6 children one day! This sudden shock causes Harada's messy family everyday life to start!

This is a manga where the 35-year-old bride (the author), describes the daily life between her and her 55-year-old husband. This includes the unique 20 years of age gap, parents' reaction to their marriage, distressed with child-making, and anxiety about the future due to the husband's old age. (Source: MyAnimeList)

Clarice, the daughter of a count, was living a happy married life... until she was suddenly killed by an assassin. The cause was her husband, Alexis. Clarice returns to the time of her engagement with her memories intact and immediately tries to break off the engagement. However, Alexis refuses to accept the break-up, and for some reason seems to be more doting and attached to Clarice than before... This is a story of a renewed engagement that begins with the betrayal of a beloved partner. (Source: Young Champion Web, translated)

A Ramen shop run by three sisters that's about to go out of business. Can Tonko's childhood friend Shiina save the Ramen Shop?

Four men and women who wrecked the ship they were on and flowed to an uninhabited island. A wild wild child, Kyoka, a group organizer, Yusuke, Chinatsu of Tsundere girls, Reichi at her own pace. Four distinctive people fish on uninhabited islands, build a house, and somehow live happily... Well, there are four men and women, and that happens a lot...! The exciting story of an uninhabited island begins with the beginning