"Gessekai" (æÂÂä¸ÂçÂÂ) (English: Moon World) is the fifteenth single released by the Japanese rock band Buck-Tick, released on May 13, 1998. The song "Gessekai" was used as opening theme of the anime '. Track three is a remix of "Muchi no Namida" from Sexy Stream Liner done by Tomoyasu Hotei.