Airi and Yuu are inseparable childhood friends who have become a couple, deeply in love with each other. The problem is that their affection constantly spirals out of control, leading to an endless string of lewd and embarrassing accidents. Airi, a naturally innocent and pure-hearted girl, cannot help but express her love in ways that accidentally turn erotic, while Yuu always finds himself swept along. To make matters worse, a sleazy playboy known as the NTR chara-o appears, determined to steal Airi away for himself. Set against the backdrop of everyday school life and domestic moments, the story unfolds as a bawdy, laugh-out-loud four-panel comedy. Later arcs introduce a bratty new heroine who also sets her sights on Yuu, a survival episode on a snowy mountain where Airi dons a male disguise, and even a bizarre twist where the playboy claims he has a world-saving mission. Despite the chaotic misunderstandings and relentless double entendres, the core of the series remains the earnest, if wildly indecent, bond between the two childhood friends.