The series '300 En no Otsukiai' follows the escalating sexual relationship between high school students Nami Yoshikawa and her classmate Suzuki. It begins with a misunderstanding where Nami, flustered and trying to return 300 yen she owes him, accidentally makes it sound like an offer for compensated dating. Suzuki, intrigued and horny, accepts what he believes is an offer for her body. This leads to their first encounter where he eagerly takes her to a secluded spot and performs oral sex on her before fucking her raw from behind. Nami, initially shocked, finds herself overwhelmed with pleasure. Their arrangement continues, with each encounter costing a mere 300 yen. The series details their subsequent fuck sessions, exploring different positions and scenarios. Suzuki relentlessly pounds her pussy, fills her with his cum, and she grows increasingly addicted to the raw, intense sex they share, blurring the lines between a simple transaction and genuine lust.