Jihad (SATOMI Kei)

(from ebookjapan):

The day before her wedding, Saeko Izawa, a prosecutor, is kidnapped by a mysterious organization due to the existence of top-secret documents she has unfortunately come across.

Sensing the emergency situation of his fiancee, Kensuke Sakuragi, a former SS (Secret Service) agent, switches to SP (Security Police) and scrambles to rescue the kidnapped Saeko.