Little Busters!
After the success of "Little Busters!" and "Ecstasy", an adult spin-off titled "Kud Wafter" was developed by Key and released on June 25, 2010. Set directly after the events of "Little Busters!", the story follows Riki and Kudryavka as they start to see more of each other in a romantic relationship at the onset of summer vacation. A mobile app game for iOS and Android titled "Little Busters! Card Mission", produced through VisualArt's and distributed via Mobage, was released on April 24, 2013. The player collects cards of varying rarity featuring "Little Busters!" characters, obtained through completing various minigame missions, to form a team. The player then trains the team's characters to improve their statistics and eventually challenge others who play the game. Paradigm published the first volume of an art book series for the game titled "Little Busters! Card Mission ArtWorks" on April 29, 2014. A Blu-ray Disc game, produced by VisualArt's and titled , was released on the first BD/DVD compilation volume for the "Little Busters! Refrain" anime series on January 29, 2014. Characters from "Little Busters!" also appeared in the mobile game "Rewrite IgnisMemoria" as part of a collaboration event.