Set in the same timeline as Sin: Nanatsu no Taizai, Nanatsu no Bitoku follows a group of angels sent from Heaven to look for a potential "Savior" to counter-attack the demonic influence being spread by Lucifer and the other emissaries of Hell. (Source: Tokyo Zerostar)

Litchi DE Hikari Club takes place in an alternate reality where the Hikari Club does not fall into disarray after the completion of Litchi, the intelligent humanlike robot the club invented to kidnap girls. The cult-like Hikari Club has had its ups and downs. Led by the enigmatic, beauty-obsessed Hiroyuki "Zera" Tsunekawa, the club has finally succeeded in using their fruit-powered robot, Litchi, to kidnap the beautiful Kanon. After accomplishing their goals, the Hikari Club has little to do other than delight in their newfound lives. From selling the technology that allows Litchi to run on lychee fruit, to modifying the robot to perform different tasks, there's no telling what antics the Hikari Club will get up to next! [Written by MAL Rewrite]

The high school boys transferred to an anime world while they are in cramming school. Since then, they start school life in the anime world they transferred in. 

(Source: MAL News)

Orihara Kouhei returns to his town after a long disappearance to fullfil the promises he made to several girls in his childhood. He suffered from memory loss, and carries a tragic past. An strange ambience surrounds the OVA...It's almost like a dream, like memories from the past trying to come together in one piece but without being able to...