 For his writing, Machida was influenced by mangaka Go Nagai and screenwriter Keisuke Fujikawa, in addition to unspecified bedtime stories told to him by his mother.The game's scenario was inspired directly by Nagai's manga "Devilman", which impressed Machida in his youth due to its dark tone.Similar to the ambiguous tone of "Devilman", Machida did not want the scenario's characters to be clearly divided between good and evil, with the villains having understandable or even laudable motives behind their actions.