In class, Yokoi is constantly distracted by her seatmate Seki, who engages in elaborate and mischievous activities right under the teacher's nose. While everyone else remains oblivious, Yokoi alone witnesses the chaos Seki unleashes, leading to her own troubles and frustrations. Despite the unfairness of it all, Yokoi finds herself captivated by Seki's antics, unable to resist the suspense that unfolds in TONARI NO SEKI-KUN.