From Wikipedia: This manga is deemed to be one of the works that initiated the "irrational" or "unreasonable" gag comic genre where the reason of its funniness cannot be explained by logic and traditional sense of humor, which made this title very popular among teens and early twenties at that time.
From MangaHelpers: The world is in a war against an alien race called "Mimics," who have taken over most of the world with a mission to eliminate the human race. Keiji Kiriya is a new recruit in the United Defense Force, which is battling against these "Mimics." On his first day of deployment, Keiji and his unit encounter "Mimics" and are all killed... Or was it all a dream? For some inexplicable reason, after every time he dies, he is resurrected and returned back to the day before the battle. Why does this happen to Keiji and how can he escape from this never ending cycle?
Kagefumi Merry takes place before the events of Yumekui Merry, and follows the adventures of a slightly different Merry than we are familiar with.
A Tokyo Ghoul spin-off about the ghoul investigators Arima and Fura during their high school days.
The Vampire Bund, a peaceful island nation of vampires off the coast of Tokyo, ruled by Princess Mina Tepes, has seen its share of conflict and turmoil. Yet there are times of relative tranquility when the Bund is a popular tourist destination. When two teenage tourists visit the Bund and are unexpectedly turned into vampires, they appeal to Mina and her loyal lycanthrope bodyguard, Akira, for help. Their only hope is to find a cure to reverse their vampirism within forty eight hours, or they will be stuck as vampires forever. Unfortunately for them, their race against time turns into a game of cat and mouse that takes them across the entire Bund in pursuit of the one person who holds the key to their salvation.
Yuzuko was left alone after her grandmother passed away. Shadowed by a mysterious organization, her family murdered by a psychopath, and with the sudden "breakdown" of the world, the missing pieces to everything is revealed, and the "Peppermint" inside Yuzuko activates...
When Sora enters high school, his homeroom teacher is a sexy gal with huge breasts and she’s none other than the changed version of Suzune, the innocent girl next door who was his first love! As the teacher’s “educational guidance” escalates day by day, Sora is awakened to pleasures he’s never known before…!
Izumi, a young art student goes to visit her old professor who is living out in the country. Izumi is trying to get away from something and wants to take a break at the professor's house for a while. When she stumbles on Sensei's secret sexual fetish, it sets off a tense relationship full of awkward moments and weird demands. Adult topics, but not ecchi.
Based on the events of the tenth Shakugan no Shana novel.
Taglines: Do you want to know this transfer student's secret? Are you going to fall in love with the world's most cheerful little girl?
Doujin Market. It is a place where individuals sell their self-published books. Each participant works daily to achieve their personal goals. While their are some who obtain their dreams, there are also those who get pounded by reality. This is the story of those who live in the world of Doujin.
Lotus Girls' Academy. A school whose aim is to educate young girls to be pure and modest. Youko is a new transfer student here, and immediately takes a liking to Shuu, who shows her around the school. However, Youko discovers a big secret about Shuu... she's a vampire! Youko then does her best to be the best friend she can be and help Shuu protect her secret... whether Shuu likes it or not! But how does Shuu really feel about Youko... and why does her blood taste so different? And to what lengths will Youko go to help Shuu?