Kosame

"We're a couple... everything's fine." Iha is an office worker who isn't interested in love. Her grandfather introduces her to a man called Shizuka Miyaji, who works for a prestigious company, and they arrange to meet. She had planned to refuse on the day, but he suggested that they go ahead with the agreement of a marriage on the condition that they have a "relationship without interference". After much deliberation, she decides to accept the proposal. Their married life together... even though they thought they wouldn't interfere, But as they live together, they gradually grow closer. A love story about two people who have never known love, starting with a temporary marriage! (from mangaupdates)

Childish Rui Sasaki is 25 years old, single, and a virgin. All she wants is to fall in love like everyone else and have sex with a nice boyfriend! While lamenting over this during drinks with her childhood friend, Naoko, she met Ritsu, a modest and handsome man. He was kind enough to listen to her complaints and take care of her drunken self. Suddenly, an intoxicated Rui falls on top of Ritsu and kisses him...?! For two beginners in love, each with their own issues, is it possible for love to start with sex? A pure story of two people in a complicated love affair is set to begin.

Hatsune Nagaishi is a high school girl who has lived a life dedicated to Kendo. She had a nemesis, Chizuru Shirakura, who she had never defeated in a match. Hatsune trains hard to win against Chizuru, but unfortunately, she gets into an accident and loses her life. When Hatsune woke up, she found herself in a different world. Hatsune, who was reincarnated in another world as the aristocratic daughter Sylvia Morntstein, aspires to be a swordsman in this world - a "knight", and decides to enroll in a knight school. However, there is a person at that school who looks a lot like Chizuru, her nemesis and rival...!? August and Dengeki G's Magazine are teaming up to create the first vertical comic project. Hatsune and Chizuru. A different world knight school story where two kendo girls grow up to become knights in another world!