Tatsuko Sachi was a stupid girl who remade herself as a 'genius' at a prestigious school in order to be near the boy she liked, Oumi Shouta. When Shouta decided to make a club to build missiles, she then agreed to be vice president. However, Shouta slacks off and leaves most of the work to Sachi. This becomes worse when a child-like girl named Onda Midori shows up, and Shouta spends all his time doting on her. Not even having super powers makes this situation easier to handle. The manga follows with their stories and the stories of the other missile club members. (Source: MangaHelpers)

An onmyouji gets temporarily reassigned to a preschool for youkai.

Naraka High School is a seemingly normal school. However, unknown to the public is the cruel truth of what really goes on in the school's halls. Rather than studying, students are forced to struggle for their very survival. And the strong bonds of friendship may be the only difference between life and death. *Note: Includes 1 extra chapter.*

A samurai volunteers himself to save his Lord's feud from an unknown menace. To do so he gets in a sort of dimensional gap, wherein he's involved in incredible situations.

When I woke up, I, a horse, had the body of a human!? I was Lukania, the beloved horse of the lonely second prince, Ladius. However, I lost my life in an attack aimed at Ladius. "Until the day of brightness, guide him from the brink of despair—,” given power by a goddess and reborn as a human, Lukania heads toward Ladius. He rejects the kindness around him and believes that Luccanya, who disappeared, is still alive, and continues searching. Amidst the darkness of loneliness. "I'll make you smile,” Luccanya decides to hide her past as a horse and vows to rescue Ladius from his loneliness within her limited time. https://www.cmoa.jp/title/280724/

Nagi Kuroki, a high schooler grappling with loneliness. Lately, something feels off. Memories they shouldn't possess, emotions they shouldn't experience. Strange memories flooding their mind. Are they human, or "Creators"? Within these memories, a girl's laughter triggers a sudden awakening of 'power.' What lies at the heart of this peculiar 'emotion'? (Source: Pixiv Comic, translated)

Intended to be a comedy, Owaru, one of the Dragon Kings, goes to Osaka to wakes snakes up. This manga version by Clamp was serialized in 1994 before being compiled in an illustration collection in 2004. (Source: Wikipedia)

Nekota Kuniboshi (aka Niboshi) is known for his perversion. All the girls at his school despise him, except for Yumeno Shizuku. Shizuku is nice, smart, and the prettiest girl. The fact that she talks to him confuses Niboshi to no end, and he has no idea how to deal with it. While Shizuku is away from her desk, Niboshi finds a half empty water bottle. He drinks out of it and proceeds to stalk Shizuku while she practices her gymnastics. As he watches her practice, he wishes that he could turn into the suit that she is wearing. To his surprise, his wish comes true! Now, he finds out that the liquid he drank from the water bottle was in fact, a chemical created by Shizuku's father that allows him to turn into any object he wishes. An odd experimental relationship begins between Niboshi and Shizuku. (Source: MangaHelpers)

Seita dies after dozing off behind the wheel and wakes up in the underworld. However, the prize that a demon extracts from him is part of his body. (Source: Anime News Network)

April 1919 - Chizuru, a girl who lost her voice as a child, is surrounded by a horrific murder case. Chizuru's older brother, an overprotective newspaper reporter, and her kind friend who she spends her after-school hours with.... Chizuru's beloved daily life becomes a thread that weaves a tale of karma when her friend gets caught up in the case...