Kika has a crush on Agi, but what does he see in her?

For her brother Subaru's sake, Hitomi decides to take his place at an all male prestigious high school for a year until he recovers and is discharged from the hospital. She gets to the school and runs into a few strange guys on her first day, but as soon as she tells them her name - they are surprised and make her go to the Lion Club. Hiding the fact that she's a girl will be difficult enough and now she has to deal with this strange group who are forcing her to join their club because they all believe that in their past lives they were members of the Shinsengumi!

Description by LuffyNoTomo

The hijinks of the 'Society for the Discovery of the Truth of Occult Phenomena'.
What happens when Mano Masumi suddenly gains the power to see ghosts?

From Kirei Cake:

Suzu is your typical school girl looking to live an ordinary school life...

...Up until she realizes that she's attending a school populated with vampires, who have the ability to attract and hypnotize women for their own thirst.

Then comes Akishiro, a relatively quiet boy but is a vampire, who attacks Suzu and ends up sucking up most of her blood, to the verge of death.

However, what happens when Akishiro develops a weird affection for Suzu, where he can't bear to see her being bitten by anyone else?

On the day of the high school exam, it fell before Chiyo, a boy like Light, General (Tasuku). I assume that he is bad, Chiyo... But actually he was a motorcycle racer. It's Chiyo, but the general is showing me a new world that I didn't know about.

From Chibi Manga:
Because she loved the word "wisdom", Rui hated the words "waste" and "fuzzy". One day, a guy named Shou appeared in her life. And thanks to that encounter, Rui will suddenly change... And that's the beginning of a "rainbow school daze" between that super dry girl and that careless guy.

Nika is a 3rd-year middle-school student with social anxiety. One day she drops her eraser in class, and slacker Akira picks it up. After school, Nika follows Akira to an ice rink in pursuit of her eraser. There, she discovers Akira’s beautiful figure skating and her own love of the ice. Alternatively, Kiwako is a brash young champion ice skater and Akira’s childhood friend. Akira tells Kiwako that one day Nika will become her rival. Which genius ice skater will become The Ice Queen?

Maximillian von Bismarck is a german highschooler, that enjoys meat and action movies. He goes to school with Lisa Himmler, the cute grand daughter of some german army commander.

From BL-Gyaru and Must Be Endless:

He hit me again today. My lover Kan-chan, that is. But that doesn’t really matter. My love is being rusted by our bodily fluids. Mayama, my middle school classmate, has appeared before my rusted self and become conscious of my bruises and scars. But you want it to be like the past, on that rainy day you kissed me and froze… I won’t be satisfied with a naïve love. Drawn by Ogeretsu Tanaka, this is a story of true love and pain.

From Dan of Population GO:
Based on the light novel of the same name, Kishimine Kengo has avoided playing video games his whole life in a society filled with it. Instead, he prefers the comforts of books of which he has a tendency to get drawn into the story, perhaps a little too much. Every time he reads a story he unintentionally imagines reliving the story as the protagonist. When Kengo learns of the Modern Game club fate may let him use his imagination for another medium, video games.

From the master of love comedy manga, Wakabayashi Toshiya, comes a high school fairy tale about love☆!

Shindou Rei (Cinderella) comes from a very poor family. Her only clothes are hand-me-downs from her brother, even her school uniform. So everyone always mistakes her for a boy. Even her close friend Hakuba Ouji (white horse prince), who starts developing confusing feelings toward her all the while believing she's a boy. Tsukumo Yuki (Snow White) is the leader of a delinquent gang and falls in love with Rei at first sight, also believing her to be a boy.

From MangaHelpers:

Scientists predicted an imminent meteor impact on Earth that would annihilate civilization, but contrary to their prediction, the meteor missed Earth. Though avoiding immediate destruction, humanity found that the meteor left behind something in its wake, something that would change the course of civilization forever: a new form of bacteria that ate through all known metals.
Facing this new era where all metals turn to ash, Jinkichi and his classmates will have to survive with little help from the Japanese government. Some of his classmates have already begun to understand that the norms of the past have collapsed, and lawlessness will be the new law. Jinkichi will have to protect himself as well as his classmates from the violence that ensues.

A boy from the future meets a girl from the present. Together they are destined to save the world.

Chigira Chiaki loved the tales of Kuroyukihime and Black Lotus her beloved elder brother told her about.

Returning to Japan after a long stay in America, Chiaki entered the Private Seibi Academy for Girls. There, she met the club members of the Enbuken and starts her journey into the Accelerated World.

Yanahara Taichi joined the Acting Club for the first time, but the only problem is that he gets too embarrassed to do anything! As the 3 girls in the Acting Club help him with his troubles, Yanahara eventually gains the courage to do something outrageous, but it only stirs up trouble!

From Senpai Scans:

Himesato Ui has just enrolled in her late mother's old high school, Shinomiya Academy, as a first year! Hatsu's mother was known as "Prima", the most beautiful girl, in the Academy. Ui was full of hope and expectations in enrolling in the Academy, but she was puzzled by the Academy's system of evaluation for students was by a point system. Furthermore, in the school, she met an unknown pretty boy?!

Watase Marin has a special ability- she is able to see ghosts. However, there's a catch. Ghosts are able to take over her body if she makes eye contact with them! What happens when a cute girl ghost decides to stir up some trouble and make her confess, then kiss Horin-kun, a guy in her class that she likes?

A teacher named Kadomae Kazuma has the principal's daughter Noeda Kanade for his class in a new school semester. At first glance, she appears to be a quiet girl, but she's awakening her aberrant love towards Kazuma? This is a psycho love story that accelerates thoughts and actions.

From Shoujo Sense:
Ryuuji is not your average high school student. With the family business struggling, and the atmosphere at home growing tense, he doesn't have time or the money for leisure—he's too busy with part-time work. So of course, when a talent scout offers him a place in the dog-eat-dog world of the entertainment industry, he turns him down. Except this talent scout is surprisingly persistent...

The first person who hurt me was of my own gender. Tsubaki is in the same class as Kaoru and Koutarou is the gentle big brother. What embrace their souls are desires and tenacity... They are hurt, they throb, they are drowned, they cry... They love with their body and soul, these are the real ordinary lives of these boys.

(Note: the title for this manga (Dousei Ai) generally means "homosexuality", however, the kanji used has a different meaning than the kanji that are properly used for spelling "homosexuality". The kanji for this series is the same for "living together" (同棲) instead of (同性) which means "same-sex")