From AnimeCouncil²:
In times gone past there was a Lord, one who loved Konnyaku. He loved it so much that he ordered his ninjas to protect the family of the finest Konnyaku makers in his land. The protection of the family continues even to today, Mamo-kun, youngest of the ninja family protects the innocent and naïve Yuuna from sinister forces, though more often from herself.

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When K-books turned 15 years old in 2008, a collection consisting of artbooks, special phone cards and many other products was released, to thank its customers. Please read the below notes carefully for the contents of EACH volume.Note #1: This collection comprises of 2 separate artbooks as in, 1 for the boys and 1 for the girls. The particular names are Boys side and Girls Side and neither of the 2 are likely complete. Note #2: Boys' side = often ecchi and with some images featuring some nudity. One of the images was lolicon, soo I left it out in accordance with Batoto's site policy. I mean: you don't want me to start censoring by drawing on someone's art, right? The image in question was by Kiyotaka Haimura, if anyone's extremely curious. Girls' side = mostly shounen-ai but some of the images are not. Nothing that really qualifies as "mature" for this artbook.

Juushingura is about a samurai girl protecting her master and Oo-oku, a place where her master's concubines stay.

A young boy goes on a date to the beach with his senpai.

Two girls, Kurusugawa Himeko and Himemiya Chikane, who have a close friendship that is secret from their classmates, are suddenly confronted with their fate to be the Priestesses of the Sun and the Moon. When an ominous lunar eclipse occurs on their shared birthday, they are forced into a pitched battle against Orochi and his forces, who wish for the total annihilation of the planet.

But it's not quite that simple. Himeko has feelings for Chikane--and for one of the Orochi's "Necks," Oogami Souma, who somehow has the ability to resist the call of darkness, though not without cost. What will happen as these people learn to live their predestined roles?

Shinka and Sagiri, the two heroines of our story, fight yokai to protect people. In daily life, they attend school, and work as voice actresses. The story includes characters and elements loosely based on Japanese folklore, Shintoism and Buddhism.

From Studio ADTRW: After suffering numerous interstellar wars, mankind has finally formed an interstellar union. However there are still many disputes and wars occurring amongst the members of the union itself. In order to resolve these problems, a secret organization, known as GOTT, is formed. They employ agents with special powers to fight for the organization. Agents Eclair and Lumiere are two girls with outstanding abilities, and they are assigned as partners. Together, they fight, and slowly uncover more and more about the secret of the organization that they work for.

Sou is a God of Death, who's fallen behind on her quota. She looks through the 'Black Book' filled with dangerous souls. Though when she offers Ashiya Makoto anything she wants in exchange for her soul she gets an unexpected request!

From Dynasty Scans:

10 years ago, high-school student Sanpeita dreamed he was engaged to a beautiful girl. One morning, an unknown homely girl suddenly pressed him for marriage. The homely girl was named Kemeko.
In order to escape, Sanpeita left for school where Kemeko followed and showed up with an uproar. A larger disturbance was when Sanpeita was targeted by a rice cooker on the school's rooftop.
As Sanpeita and his childhood friend Izumi were being attacked by the rice cooker, Kemeko saved them both. What is the girl's true shape!?

Katsuko, the daughter of a prestigious line of butler's that has served the Ootori family since long ago, now has to deal with the heir of the Ootori family and also the principal of High school that katsuko attends. Her life is becoming more and more busy than usual because she have to serve the eccentric young master plus attend to High School as a normal student.

Due to family troubles, Ren Uesugi and his sister, Mihato, leave their home. They end up moving to the city but find themselves with a lack of money. Somehow they are able to find work in the form of the Kuonji family's mansion, being employed as servants to the three sisters of the Kuonji family: Shinra, Miyu, and Yume. Being a servant also associates Ren with the mansion's additional servants and the Kuonji sisters' friends.

Kazuki just inherited a large sum of money, the only problem is, there may be a hitman out for his life.

A spin-off of Mitsudomoe, this series is comprised of single-page chapters that could not be published along with the original manga.

Kamisu Iori is at that age when he really wants a girl, but he's about to get more than he bargained for. Iori is taking a nap in the forest when a cute girl with cat ears and tail falls on him from the trees. She scurries away and he chases her through a mysterious door somewhere in the forest. Iori wakes up in a café where he learns that kittens actually take the form of a human with cat ears and tail just like Keena, the cute girl he was chasing. But when he accidentally breaks the door that he came through, Iori has to work at the café surrounded by “kittens” until it gets fixed and he can go home.

Goraku Gakuen is a school with over 300 clubs and student associations, and all of them are under the supervision of the Student Council. After encountering the Student Council President, Gokou Karuta, a girl who avoids most of the clubs, is asked to be the Secretary. Thus begins her work of inflitrating and monitoring the often wacky clubs...

This book contains game illustrations from the artists who created today's popular Korean illustration basics and 15 up-and-coming Korean artists, Kim Hyung-Tae, Opon, isanbon, popcorn, NG NoranGom, Shukei, Limha, Lekan, Tiv, SR, YiLee, Isurugi, SeeD, MonsterGOGO, panamaman, maggi!

Includes over 200 illustrations of game visuals, character illustrations, and original art work on top of a special interview with artists.

Hino Akiharu lost his parents when he was an elementary student and was taken in by his uncle's family. One day, he sees on the news about the newly-established Hakureiryou Gakuin, a school which was re-built from an elite girls' school. He decides to take the exam for that school and succeeds in entering the House Management Department (the place to train maids & butlers). He wants to become a butler, although his appearance scares the ladies. Akiharu has a sinister look in his eyes, a scar on his right eyebrow, and bristled up hair. Add 3 piercings on his ears and he indeed has a typical bad boy look on him. He meets his "nemesis" at that school, Saikyou Tomomi, a girl with a two faced character who traumatized him many times since they were kids. Another girl named Cernia Iori FlameHeart chases after him because of his looks and calls him suspicious. Still, Akiharu starts finding his feet at the school and his relationships with the girls also get better...

From Hidoi~! Translators:

"Even if we suck at soccer, we still have maid cafés...!"

In a not-so-distant future Japan, the popularity of maid cafés have skyrocketed, and maids are revered as national idols. Battles are fought between the maid cafés to determine which one is the best at serving their masters, and they are all aspiring to be like the supreme maid and waitress (which is an anime character), Minori-chan! Kamagaya Misaki is close to achieving that goal - all she needs is Minori-chan's original maid uniform, which is rumored to exist in real life! However, it seems that the secret behind Minori-chan and her uniform is...?