While the content is inherently controversial, the popularity of Spikespen's work globally can be attributed to:
The core of the "test" is the internal monologue of the protagonist as they struggle between familial duty and the "temptation" being presented. Why It Appeals to a Global Audience spikespen japanese brother and sister temptation test
These stories rarely reflect real-world social norms in Japan. Instead, they function as a form of "high-tension" escapism, utilizing the proximity of living together to create dramatic irony and suspense. While the content is inherently controversial