A demon kills married couples while an angel tries to stop her, but cannot. Why?

This is only a partial of the original artbook.

Many years after the fall of Zoma, the descendants of Roto left Alefgard and divided his emblem into two parts. The brother with the top half, created the kingdom of Loran. The brother with the bottom half, created the kingdom of Carmen. The kingdoms were peaceful and prosperous for many years. Emblem of Roto begins 100 years later.

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A manga anthology based on DMM and Nitro+'s browser game Touken Ranbu -online- 

A mysterious boy who brings peace to deserted places and things one day finds the skull of a dead girl...

Rino hates dogs, and is afraid of them. One full moon night, she finds out that her crush, Misaki, is really a werewolf. And that same night nearby, a janitor was found dead and covered with marks from claws and teeth.

Well, I don't think this is an artbook but instead, it seems to be a series of illustrations(of varying quality)? Illustrated by Ji-Yun Chae aka kkuem

Description not available, please purchase DLC.Just kidding! I'll translate it later.[Translated by Caek]

From Lezhin: In a world where man and man-beast coexist, the violent king reigns ruthlessly over the man-beasts. Join the adventure to free man-beast from the tyrant's oppression. Original Webtoon http://www.lezhin.com/ko/comic/thewizard

The story follows a family of mask-makers and their reclusive son who has completely shut himself off from the world...

From MangaToshokan:
This is a story of fairies, told in a place without a name. Once in every 100 years, a young fairy from in the deep bush must come to the human world to become an adult. They use 'power' to attract a human male, to fall in love with. Afterward, the man dies. But, the fairy to whom he'd given his love will grow wings and become a beautiful adult.

This fantasy romance story starts off with a fairy of Grass, named Grassbee, going to the human world to become an adult. Will she be able to attract a human male? Will she be able to become an adult fairy and get fairy wings? Magic can only do so much...

Ever 17 Visual Fan Book, especially, for those who read the visual novel.

One-shot:
Marshmellow is the head of a gang of thieves known as Mitsukubi Condor, and he is obsessed with beauty. One day, a girl named Cocoa comes to him, trying to find the harp that was precious to her village. He decides to help her recover the valuable harp, which plays beautiful music that can draw out rainbows!

Series:
Many years ago, an evil witch ruled the continent, and she had many magical treasures. Now the land is ruled by a king, but the witch's treasures remain. A young amateur thief named Sue is determined to sneak into the nearby ruins and steal treasure to help her poor village. On her way, she runs into one of the 3 legendary thieves, Marshmellow, who is obsessed with beauty. He isn't quite as suave as she'd expected, but he seems to have the same eyes as the ancient witch. After their first adventure together, Sue joins him on his journey to collect all the witch's treasures. He claims he is only interested in their beauty, but what will happen if he actually recovers them all?

A full-colour oneshot about the adventures of the prince of Yamato and hero of numerous battles, popularly known as Yamato Takeru...

From Aerandria Scans:
In a certain part of town, there is a very exclusive restaurant. So exclusive that only ghosts get to dine there! Yes, it’s a ghost-only restaurant where ghouls and goblins freely roam, drink, and eat! Strange? Not until you meet the only waitress there, who happens to be a full-blooded human!

Ryoma Nagare, Hayato Jin, and Prof. Saotome pilot three specially designed combat jets, which can be combined together in different forms to form three different kinds of giant robots, Getter-1 (used for aerial combat), Getter-2 (for land-based conflicts), and Getter-3 (for undersea battles). They were assembled by Prof. Saotome and became Earth's first line of defense against the Dinosaur Empire, which is a civilization of reptile-like humanoids, who evolved from the now-extinct dinosaurs that roamed the earth millions of years ago.

The series was groundbreaking in the anime mecha genre: for the very first time, it introduced the concept of separate machines combining to form a super robot. Using three jets, Getter Robo could combine in three different ways to create three different versions of Getter Robo for different conditions and situations. This idea was originally discussed during the creation process for Mazinger Z (the first super robot to be piloted internally), but was dropped and then developed for Getter Robo.

After Emperor Gore and the Reptilian empire is defeated, a new enemy, Emperor Burai and his Hyakki empire rises and threatens to take over Earth. Ryoma, Hayato, and newcomer Benkei pilot the new Getter Robo G to save Earth.

Set in a post-Apocalyptic Earth, Hayato Jin continues to lead the Saotome Research Institute after the events of Getter Robo Go. He has succeeded Professor Saotome's masterpiece prototype, the Shin Getter Robo, with a more stable creation: Getter Robo Arc.