Nama zuki oneesan: Okuchi nara nandodemo (1997)

Kenji, a student who has failed his university entrance exams three times, was living a restless life. He was currently staying at his older brother's house. His newly married brother and his wife would start having sex every night. Kenji, who would sneak a peek, couldn't concentrate on his studies. To make matters worse, his brother's junior, Mika, was moving in next door...