Grisaia no Rakuen begins right at the end of the previous installment, Grisaia no Meikyuu. Kazami Yuuji is arrested under suspicion for terrorism. A video showing apparently concrete proof that Yuuji committed these acts, and he is held in custody by Ichigaya. Ichigaya knows full well that Yuuji didn't commit the crimes he has been accused of. But he did fail to assassinate Heath Oslo, who is the leader of the terrorist organization with an extremely devastating weapon in their possession. In fact, Ichigaya have their own plans for Yuuji... But all may not be lost for Yuuji. The girls of the Mihama Academy are not about to let Yuuji be used for political gain, and neither may the mysterious new figure which appears before them.

To the casual eye, the amnesiac bounty hunter Wu Liuqi looks quite intimidating. With his deadly telekinetic scissor techniques and his ability to seamlessly transform into anything, one would not expect his modest demeanor. In fact, Wu is quite terrible at his job. Often times the freelancer can be found botching an assassination or targeting the wrong person. While his failures could be due to his subpar skills, it usually boils down to him being a normal kid, with a heart unsuited for his line of work. Accompanied by his feathered friend Dai Bo, Wu is on a simple quest to regain his memories. Although his inconspicuous day job as a hairdresser and his after-hours occupation are simply a means for him to repay debt, his various ventures seem to intertwine with his pursuit to recover his lost past. [Written by MAL Rewrite]

How do you resolve a conflict between powerful spirits of famous heroes for a prize capable of granting any wish? Wage a war that will cost your blood, sweat, and tears? Too much work—how about a game-show competition instead? Carnival Phantasm takes a number of characters from Type-Moon's original works, and puts them in a variety of light-hearted scenarios which parody their respective series. Watch Lancer suffering due to his low luck stat, or watch the egotistical King of Heroes gladly kneel to a dominatrix King of Knights. Just remember to leave your sanity at the door.

The group of privateers known as the Blue Steel continues their mission to deliver blueprints of the Vibration Warhead Torpedo—a weapon that may turn the tides of war in their favor—to the United States. However, a new threat arises from their enemy, the overwhelming Fleet of Fog in the form of "The Student Council.," This is a group of warships composed of the remaining Mental Models—the ships' humanoid avatars—who have yet to face the unpredictable captain of the Blue Steel, Gunzou Chihaya. As the Blue Steel gets closer to understanding the origins of the authority controlling the enemy, Iona's past starts to reveal why the war began and her reason for siding with humanity. [Written by MAL Rewrite]