18+ Katainaka ni Totsuidekita ○-ssia Musume to H Shimakuru Ohanashi

Kenta Suzumura is an unemployed man who has never managed to maintain a job or a loving relationship. On the other hand, his brother Kouta is handsome, intelligent, and married to a beautiful Russian woman named Arisa. However, when Kouta announces that he will be away on a business trip, Kenta decides to seize the opportunity and "educate" Arisa about Japan in the absence of her husband—of course, in the most obscene ways possible...