The immense popularity of the search terms surrounding this title stems from its strategic use of specific, high-demand tropes in Japanese media: 1. The Younger Brother / Step-Sibling Dynamic
The phrase itself seems to capture a universal feeling in a culturally specific way. The emphasis on being extremely lazy at home resonates with many people around the world. The casual tone suggests an informal setting or relationship between the speaker and the listener. uchi wa no utouto maji de dekain