Sugar Bunnies Chocolate!

It's November. A student who has lost his keychain comes to Miyano and his friends, who have taken over the disciplinary committee's workload. On a whim, Hanzawa proposes the establishment of the "First Lost and Found Detective Agency," which goes out on a search party. (Source: MAL News)

In the wake of a third world war which left Japan in ruins, an organization known as Vischio seized control of Tokyo and renamed it Toshima. Taking place in its back alleys are battle games known as Igura, overseen by the Vischio, in which contestants battle and bathe in each other's blood to earn the chance to go up against its tournament's king, Il-re. Igura is not the only fighting tournament around; Bl@ster is a similar yet vastly different game since it prohibits murder and the use of weapons. The only way to win is by knocking out the opponent. Akira, a young man isolated from his family, is known to be undefeatable at Bl@ster. However, his life on the top is shattered when he is accused of murder. Unable to prove his own innocence, all hope is seemingly lost... that is until a mysterious woman named Emma appears and offers him a chance. Now, to regain his freedom, Akira must participate in Igura and ultimately defeat Il-re. [Written by MAL Rewrite]

Kousuke Mikado has been able to see spirits for as long as he can remember. Extremely terrified of them, he tries to suppress his ability by wearing glasses. One day, while working at a bookstore, he catches the attention of Rihito Hiyakawa, an eccentric medium who is convinced that they were destined to meet each other. Thanks to Hiyakawa's antics, Mikado is thrust into the world of the paranormal, with the former promising that he will shed his fears if Mikado stays with him. As they continue to work together, the two discover a series of malicious curses that all point to the same name—"Erika Hiura." What is this person's goal, and how do they connect with Mikado and Hiyakawa? [Written by MAL Rewrite]

Second season of Wei, Kanjian Erduo La!.