Zoku Shin Wild 7

(from ebookjapan):

Wild 7's Tairiku Tobiba was being targeted by assassins and was unable to visit the captain who saved his life. At the same time, a mysterious "cult of the end of the century" was causing a stir, appealing to issues of "overpopulation".

The captain's daughter, Eiko...disappeared with a huge explosion. All these seemingly unrelated events lead the Wild 7 to the truth of an unexpected incident!