ハチミツにはつこい

Koharu Shiina and Natsuki Sugiura have been inseparable since they were born next door to each other. As childhood friends, they share a bond that's as sweet and comforting as honey. But now, with high school on the horizon, their relationship begins to evolve amidst the flutter of new feelings and the storm of teenage emotions. As Koharu grapples with jealousy over Natsuki's interactions with other girls, and Natsuki remains seemingly oblivious, the line between friendship and something more starts to blur. (Summary by Grok 2)