Koisuru Otome to Shugo no Tate - The Code Name is "SHIELD 9"

Name: Kisaragi Shuuji
Parents: Deceased, adopted by the chief of the VIP protection Division of Aigis
Job: Bodyguard for Aigis Security
Codename: Shield 9
Current Assignment:
To infiltrate the St. Theresia Gakuen for girls undercover under the guise of "Yamada Taeko" and protect Kasugazaki Yukino and Tsubakihara Ren against unknown attackers.
Allotted Equipment: Standard gear as well as a bulletproof crossdressing kit.
...
Expected Complication: Shield 9 having problems with pretending to be a girl and interacting with ladies.
Unexpected Complication: Error - data disk failure...