After his initial move and the chance encounter that led to an indecent "sex-friend" relationship with his neighbor, , Nanashi finds his life spiraling into further complexity. What began as a simple outlet for his fantasies about the kind-hearted housewife next door has evolved into a web of social and emotional tension.
It seems you're referring to the Japanese adult visual novel / anime series Boku ni Sexfriend ga Dekita Riyuu (The Reason I Got a Sex Friend), specifically , and you mention "of 4 updated" — likely meaning you're looking for the fourth and final episode (ep. 4) , but labeled as ep12 in some collections (since some releases split each episode into 3 parts, making 12 total). boku ni sexfriend ga dekita riyuu ep12 of 4 updated
The relationship does not "begin" at the end. It has been existing all along, unnamed and unforced. After his initial move and the chance encounter
If you're a fan of the series or interested in anime that explores mature themes, I recommend checking out "Boku ni Sexfriend ga Dekita Riyuu" and sharing your thoughts with fellow enthusiasts. 4) , but labeled as ep12 in some