The Academy City, where the pinnacle of science and technology converges to advance psychic development. But behind the seemingly peaceful and glamorous facade of this city lurks a “dark side.” The girls known by the codename “ITEM” are a part of this world. They form an elite unit composed of specialists in various fields, led by the Level 5 esper, Shizuri Mugino. When a new member joins “ITEM,” she will find herself drawn into a conspiracy lurking beneath the city's surface... (Source: Dengeki Daioh, translated)

Kanade Tachibana is a beautiful girl known as "Angel-chan" at school. She is traveling all over the country in search of "someone." One day, while staying in Kanagawa, she met Yuri Nakamura, a happy and cheerful girl. Along the way, other people who look like SSS members (?) also appear!? Will Angel-chan be able to find that special "someone"…? (Source: Kadokawa, translated)

Valentine themed oneshot from 2008. Full colored and 8 pages.

The spinoff series follows Yukina, Nagisa, and Kanon in their everyday lives in middle school

When Hayama Miu was young, she dreamed of becoming a florist inspired by her father's words. Now she is a 16 years old hardworking student with a goal to become a government official and no time for childish dreams. One day she is asked by her grandmother, who is also the school's board chairman, to help with the school's old greenhouse. There she encounters the spirits of roses, lilies and other flowers, and so her life takes an unexpected turn...

A man seeking family background, a woman seeking financial support. It was supposed to be a loveless, arranged marriage. But Renande falls in love with his wife, Elise, who is pure and kind to everyone, and the two begin a happy married life. But the story doesn't end with a happy ending. (Source: Kadokawa, translated)