One day while Shirou is delivering a secret device to his colleague, he meets Amane Mao, a super-strong girl capable of lifting cars. This device, the VITA system, is a new weapon theoretically capable of defeating ERRORs: a breed of enormous, cybernetic mutants that necessitated the use of weapons of mass destruction on Old Tokyo fourteen years ago.
Suddenly, one such ERROR appears before the two and goes on a rampage. Shortly after a failed argument to convince his colleague to approve use of the VITA system simply to save civilians, his colleague is devoured by the ERROR. Faced with death, Shirou has no choice but to accede to Mao's request to activate the super-weapon and destroy the ERROR.
...and thus Shirou's eventful days as the male master of the VITA system at St. Liddel's Girls' Academy are about to begin...
(Source: Edited from AnimeSigma)

1. L♥DK bangai-hen (Watanabe Ayu)
2. Yamato Nadeshiko Shichi Henge: Rika Shitsu no Chuushin de, Ai wo Sakebu (Hayakawa Tomoko)
3. DAIDAI DAYS: Kenka Joutou♡Kareshi (Higuchi Megumi)
4. Aguriko: Mangetsu no Yoru ni (Ishiko)
5. Oshioki wa Necktie de (Nakamura Matccha)
6. Hakuchuu Nemurihime no Yuutsu (Rokurokutei Idzumi)
7. Koharu Biyori (Higuchi Nichiho)

A sweet love story that will melt your heart!
A gathering of the sweetest boyfriends.
“No matter where you are or the time of day, I will protect you.”
Contains 6 One Shots from 6 different Mangaka.
Source: Midnight Scans

A sequel to Mai Otome,which introduces Archduke Nagi's younger sister. Who is disguised as a man. Arashi (Nagi's sister) has bought Garderobe and all of its properties. The story starts from there.