After getting his first girlfriend, a man confides in his adult childhood friend Kokona that the relationship still has not progressed to kissing. Though she congratulates him, her troubled expression hints at hidden feelings, and she offers to let him practice with her. The instant their lips meet, restraint disappears. Long tongues and strings of saliva leave them thoughtless, and they cross the line into passionate kissing and sex. His girlfriend vanishes from his mind as he gives in to forbidden pleasure, falling deeper for Kokona with every kiss.