If you're looking for manga similar to Reincarnated as a 15-Year-Old Queen: I’m an Ex-office Worker, but the Young King Is Interested in Me?!, you might like these titles.
Izumi Maya, a 33-year-old professional pastry chef who went out to buy some mustard, gets caught in an accident. But when she regains conciousness, she find she has been reincarnated as a 12-year-old princess! On top of that, she also has a husband who was older than her! And a king, no less! Maya realizes that she's in a position where her life might be targeted, and decides to try to get along with her new husband in order to protect herself! In the name of being a pastry chef, I’ll defeat anyone who'd threaten my life and my husband’s stomach at the same time!!
Izumi Maya, a 33-year-old professional pastry chef who went out to buy some mustard, gets caught in an accident. But when she regains conciousness, she find she has been reincarnated as a 12-year-old princess! On top of that, she also has a husband who was older than her! And a king, no less! Maya realizes that she's in a position where her life might be targeted, and decides to try to get along with her new husband in order to protect herself! In the name of being a pastry chef, I’ll defeat anyone who'd threaten my life and my husband’s stomach at the same time!!
Reincarnated as the blond-haired, blue-eyed seventh prince?! Save the kingdom with "office worker" skills!
The day before 35-year old otaku lady Ryouko Hayakawa's birthday, she met her end in this world by way of a traffic accident ― or at least, she was supposed to. But when she opened her eyes, she found a fantasy world. She reincarnated as blond-haired, blue-eyed, seventh prince, Herscherik! Fully enjoying a leisurely prince life free from worldly cares as a prince, Herscherik finds the king of this great country despised by retainers and officials alike, with corruption running rampant; quite the unpleasant state of affairs. Realizing this at a mere 3-years of age, to save the country Herscherik relies on the "office worker" skills and "conman ability" from their previous life, and now takes action!
Shinichi Tanaka used to be a representative director of a large company, but now he is homeless without money or family. On a rainy day he is struck by lightning and awakes in a strange place in the body of his younger self. What is the mysterious place he finds himself transmigrated into? A weird and turbulent adventure story of a 56-year-old man who reincarnates into a different world in his 25-year-old body!
The beautiful lady, Louise, has memories from her past lives. And there are 7 peoples' worth of lives (moreover the villain’s role). Louise, who has always met the bad end of getting stabbed to death, has decided that she will live this life peacefully. However, Louise has been assigned as Prince Emile's instructor! And so, she struggles with teaching the extremely shy prince who shuts himself up in his room. In her 8th reincarnated life, she will do anything for a happy ending!
"I just want to be lazy!!" Haruto, a college student, who dreams of being surrounded by fluffy pets and enjoying delicious food, wakes up one day to find he has been reborn into a different world as Prince Phil Gleshart (3 years old). He starts working towards his long-awaited lazy life, but... his pet is a fierce beast?! Everyone loves his food?! Whatever he does seems to backfire, but surely he'll be able to relax someday...?!
The daughter of a marquess, Julianna is known as the "perfect lady" by society. However, she has a secret. She's only enjoying acting like the perfect lady! Her true self is hidden under an invisible mask. One day, she is summoned by Prince Edward, the "perfect prince" who is actually a black-hearted schemer! At the royal palace, he gives her a fiendish order. "Become my pawn. You don't have the right to say no!" (Whoa... The prince is so evil!) Julianna reluctantly accepts her duty to act as the prince's pawn, if only to achieve her long-cherished wish, which is...
Yoshida, who worked for a black company, died in an accident. Due to a mistake during reincarnation work, he couldn’t be reincarnated in his original world. God suggested him to reincarnate in a different world with a mischievous angel, who unwillingly accompanied him, as his support; and the two were born into the world of sword and magic as twin brother and sister. A few years later, Yoshida took magic lessons from his angel sister and began his special training so that he could lead a fulfilling life. But the younger sister, who changed her mind to enjoying this world, was aiming for a parasitic life where she could live comfortably, so she continued training her brother so that she could use him well. Being an adventurer, or the third generation of inn owners, Yoshida’s second life with a younger sister, who doesn’t wanna work, begins.
A good person reincarnated into another world as a grandson of the king?! On top of that, now he's a handsome young boy with tremendous magical power and cheat-like abilities! He has silver hair and blue eyes that are said to be characteristics of a God, and he is also given the mysterious title of "The Child Loved by God."