Takarakuji x Rope  

Lottery x Rope, Kamiusagi Rope 5 ONA, Kamisusagi Rope Takarakuji Collaboration, 宝くじ×ロペ

In collaboration with Kamiusagi Rope and Takarakuji, a nationwide lottery system in Japan, there was an event held in 2013 to celebrate the fact that it had the highest winnable amount (800 million yen) at any point in time. This event was included on the DVD release of season 4.