Genre - Romance

From Day of the River: One day, Takamiya Naho receives a letter written to herself from ten years in the future. As Naho reads on, the letter recites the exact events of the day, including the transfer of a new student into her class named Naruse Kakeru. The Naho from ten years later repeatedly states that she has many regrets, and she wants to fix these by making sure the Naho from the past can make the right decisions—especially regarding Kakeru. What's more shocking is that she discovers that ten years later, Kakeru will no longer be with them. Future Naho asks her to watch over him closely.

What happens to a female vampire trying to live a normal school life when she meets the most popular boy in school and nips his neck?

KOR is the story of the Kasuga family, but mostly the oldest son, Kyosuke (who narrates), as they move to a new town after being found out to be a family of ESPers. Kyosuke meets a pretty young girl as he counts the "100 steps" (there may only be 99) that lead to his new school and is immediately smitten. However, the pretty young girl, named Ayukawa Madoka has agreed to help her best friend Hiyama Hikaru win Kyosuke. Thus, a love triangle is born.

From Rayns&Lele Scans: Demons will grant any human one wish in exchange for their soul. Anzamnia, an ambitious demon, has fallen to the bottom of the chart, having collected zero souls. After being kicked out to earth by the police, he found himself in Japan, in search of a human contractor in order to get back home. Then he crosses his way with a lonely little girl, who is convinced he is an angel sent from Heaven and insists that he grant her wish and form a contract with her, knowing it will take away her life? Anzamunia's first contract is formed, and her wish is... for them to get married?! So starts the blissful married life of this adorable and idiotic couple. A marriage of different races, ages and personalities will now commence!

From MangaHelpers: Namidare Rekka has a very unusual birthright. After his 16th birthday, he will be drawn into many different stories. Each story has a heroine, and each story depends on him to be the hero. On his first day of high school, a strange uniformed girl that only he can see shows up. She claims to be from the future, and claims that his rescuing of many heroines is going to cause serious trouble for the future. It's not long after this encounter that his troubles begin. His childhood friend Satsuki invites him somewhere, possibly to confess her feelings for him. However, before she can, she's kidnapped! Rekka wants desperately to help her, but he finds himself being tossed into various sci-fi and fantasy worlds, each with their own heroines in trouble. Will he be able to get back to Satsuki? Will he be able to save all the others? How can he really tell the consequences of his well-meaning actions? [tethysdust]

Gouda Takeo is a freshman in high school. (Both estimates: Weight: 120kg, Height: 2 meters.) He spends his days peacefully with his super-popular-with-girls, yet insensitive childhood friend, Sunagawa. One morning, on the train to school, Takeo saves a girl, Yamato, from being molested by a pervert. Could this be the beginning of spring for Takeo?

Dan from Population GO: While attending a Human/Youkai Co-ed school Fukuzumi confesses to Shiroishi Muku, classmate who happens to be a Snow Woman. He gets dumped and hilarity ensues.

Eita enters high school aiming for the National University School of Medicine. Because of his parents' divorce--and his goal--he shuns anything to do with romance or love. One day Masuzu, the school beauty with the silver hair, who's just returned to the country, enters his life in a most unexpected way. Chiwa, his childhood friend since elementary school, will not let this go without a fight.

Kohei Kurose files for divorce and is on his way home when he is hit by a car and taken back to his high school days! He returns to his high school, determined to enjoy his new life, only to find Yuzuka, his ex-wife, there...?

Mochinokome

Shimatani Shousuke, a supervisor for a distributed organization in Tokyo and Yamauchi Shinichirou, an alum of one of Japan's top colleges and bank representative, have been closest companions throughout the entire life. After them two proposed to the same young lady, to keep their fellowship in place, each of them three choose to get hitched. Will this choice unite them, or wind up with one of them being deserted?

Through their shared love of reading, Minato Tanaka met Reina Saito, a lovely but aloof girl. In an attempt to get guidance, Minato discusses his relationship with the other Reina at school with Reina Hiiragi, a senior at his part-time work, but Hiiragi's face suddenly flushes.

Amatsuyu "Jouro" Kisaragi is a totally normal second-year secondary school understudy who has two dates more than one end of the week—with the understudy gathering president Sakura "Universe" Akino on Saturday, at that point with his beloved companion Aoi "Himawari" Hinata on Sunday. Unfortunately for Jouro, the two young ladies announce their adoration for his closest companion Taiyou "Sun-chan" Ooga, the expert of the baseball crew. Tolerating every one of their solicitations for counsel and direction, he is presently answerable for helping the two young ladies win the core of a similar person. Unbeknownst to his companions, Jouro's amicable and inhumane picture is everything except a stratagem intended to give himself a role as the confused hero of a course book rom-com. A conniver under his chipper veneer, he causes the best of this unforeseen new development with another arrangement: to get Sun-chan to succumb to either Cosmos or Himawari and take the different as his own prize. Be that as it may, Jouro's final desperate attempt is undermined by the bleak, four-looked at Sumireko "Pansy" Sanshokuin, who shocks Jouro with her insight into his mystery character as well as an admission to the genuine self he stowed away for this time. Stuck in this cleverly muddled circumstance, every one of the five understudies must explore innumerable untruths, traps, and errors to end up as the winner.