A collection of short stories by various authors all involving secret relationships.

Soichiro helps his great-grandmother, who is a sorcerer. Although his powers as a sorcerer are no match for his great-grandmother's, he has a "special ability" that his great-grandmother does not have... (Source: Akita Shoten, translated)

In the 21st century, an earthquake devastated Japan, destroying Tokyo and leaving its people homeless and lawless. In the present, the ruins of Tokyo are a haven for thugs and street gangs, the most powerful of which is the ruthless Koryukai gang. Takateru Suga is visiting Tokyo on a mission: to find his sister Kiyomi, but things heat up once he discovers she's been kidnapped by the Koryukai themselves! With the help of a transvestite, colonel-turned-monk and a lot of firepower, Takateru must help defeat the Koryukai and save the city, or lose everything he holds dear!

It has been 500 years since Sieg, who was said to be the strongest demon lord has been taken down by the legendary heroine. The adventurers guild is fully centered around and devoted to the hero's descendants, just because they are blood related to the hero. A low level adventurer called Aru, however, got deceived by one such hero, and ended up picking up a cursed blade for the sake of his female companion Yuuna. However said cursed blade inhabited the full power of the demon lord Sieg. Having been picked as the reincarnation for Sieg, and now having the greatest power at his finger tips, the former subordinate Aru went on a journey with a beautiful Harem to destroy the depraved hero. A story of a unrivaled demon lord based on a web novel. (Source: HJ Bunko, translated)

An anthology comic of Strike Witches by various mangaka.

Seven-year-old Rika Midou is sent to Sunny Bell Academy, a children's foster home. Neglected in single-parent household, Rika seems innocent at first glance, but the staff notices signs of dark shadows in her past. Various troublesome incidents start occurring. The director, Tokugawa, quietly observes the situation...! This is a shocking work that reveals the problems related to the care and education of abused children! (Source: Kurage Bunch, translated)

Guy reincarnates in another world and his support angel reincarnates with him as his sister. Strangely enough, she begins to teach him magic with great excitement, until she gradually begins to laze around and he discovers her end goal was just to build him up enough so that she can leech off of him for life.