"Tonari no Onee-san," also known as "Girl Next Door," is a 2000 adult-oriented anime series based on an erotic game by Nikukyū. In Episode 1, viewers are introduced to Masahiko, a young man haunted by the memory of his ideal woman. Determined not to lose his virginity until he finds her again, Masahiko's resolve is tested when he encounters alluring women in his daily life, including his attractive neighbor. The episode explores themes of desire, temptation, and the pursuit of idealized love, characteristic of the hentai genre. The animation reflects the early 2000s aesthetic, with detailed character designs that enhance the erotic elements of the narrative.