Ever since he first saw her smiling face, Sekiguchi Motoi hasn’t been able to get Kobayashi Nagi out of his head. When they’re seated next to each other in class, he thinks this is finally his chance to get closer to her, but he discovers Kobayashi’s “quiet” nature is actually quite “cold”! However, Sekiguchi isn’t discouraged in the slightest! Despite being yelled at and having books thrown at him, Sekiguchi is determined to climb Kobayashi’s walls to see her smile once more!