"Are puzzles really necessary in this world?" In order to restore Jin's memory, Kaito and his friends go on a puzzle-viewing journey to England. As they're walking through the underground maze beneath the church, where young Kaito and Rook first met Jin, a mysterious girl appears in front of them. Jin calls the girl by the name "Raetsel". It seems they know each other. However, she suddenly disappears and takes Jin with her. What's more, the traps in the underground maze are activated and start coming after Kaito and his friends. (Source: www9.nhk.or.jp)

For Kanade Amakusa, life as a high schooler should have been normal, and it would have been—if he wasn't living with the most ridiculous curse imaginable. “Absolute Choice," a system forced upon him by a self-proclaimed god, randomly presents a mental selection of actions that he must act out based on his choice. To add to his dilemma, it tends to occur in the most public of places, and his options never seem to deviate from the rude and crude in nature. As a result, the helpless boy stresses through each day, fumbling to repair his already tarnished reputation while desperately praying to avoid the next spontaneous episode of Absolute Choice. To his dismay, the one in charge is always one step ahead of him and proceeds to not-so-subtly "choice" him into the lives of several girls at his school. Just when Kanade's school life can’t seem to be doomed any further, a decision that he reluctantly selects on the way home sends a beautiful girl crashing down from the sky, along with the promise of more hysterically hellish choices. [Written by MAL Rewrite]

Ikuto Touhohin just had a fight with his old man, one that led him to make a rash decision to run away from home. He boards a ship, deciding to take a vacation, but the ship is suddenly hit by a huge storm—one that sends Ikuto overboard! When he regains consciousness, he realizes he is still alive on some island. An isolated island. An isolated island with nothing but girls. Beautiful girls. Stranded on an island with only girls, no electricity, gas, radio, television, like he was back in the stone age. (Source: AniDB)

Silent, apathetic, yet mischievous, 14-year-old Rokujou Miharu is the bearer of the hijutsu, "Shinrabanshou," a powerful technique many ninja clans desire to possess to become the ruler of Nabari. Fellow classmate Kouichi and his English teacher Kumohira are both secretly Banten clan ninjas, pledging themselves to protect Miharu from his many attackers. Keeping apathetic, Miharu attempts to reject their invitation to join their ninja "club." However, after numerous attacks, he finds no choice but to join their group as a means for his survival. Slowly, Miharu takes a step closer to becoming the ruler of Nabari. [Written by MAL Rewrite]