D-Again is the fifth 4th Unit game. The criminal trade organization WWWF was finally defeated. The bionic soldier Blon-Win is appointed a high-ranked inspector and sent on a mission to protect the secret service agent Remi Binderk on the way to the United Nations conference in Geneva. On board the TGV train in France Blon-Win encounters her old acquaintance Dalzy, who tells her that former WWWF members have united to form the Einheit group, and are working on a new dangerous weapon known as G-R.