Kurumi Hanazono is taken aback when she spots her childhood friend Nagio at her school - he's hardly recognizable! Overcome with fond memories, she heads to their secret childhood spot, only to be plagued with embarrassment when she remembers a sweet, innocent kiss they shared before he left town.
Nagio is back in town, and when he surprises Kurumi by showing up at their old secret spot, they reminisce about the past. But Nagio shocks Kurumi even further when he plants a smooch right on her lips! As it turns out, Nagio's changed in more ways than just his appearance; he's mischievous and unpredictable now.
Unfortunately, Kurumi's older brother Ataka isn't having any of Nagio's antics. He can't stand to see a boy getting cozy with his little sister, so he throws a major tantrum and vows to drive Nagio away from Kurumi.
Despite the risks, Nagio's determined to pursue a relationship with Kurumi. With her brother always hovering nearby, Nagio's forced to be creative in his attempts to land kisses from Kurumi.
