The Sweet 18 Ji-eun has been BFF’s with her friend next door Min-cheol for more than 10 years. Normally there isn’t “just friendship“ between boys and girls but they have been claiming that they’re just friends for the past 10 years... However they come to school together, get out of school together, and when they go play the both of them go alone... Will they really be able to remain “just“ friends...? A story far from love~ but closer than just friendship~ Ji-eun and Min-cheol’s strange school diary [Balls Friend]!