Shige, a naive man who was always focused on mathematics, as he spends the 24 hours leading up to that thing he does with his childhood friend☆ One day, Shige is shocked when he sees a video of someone doing "that" on his smartphone. This is because, at the age of 18, he has never learned how to do "that" before! Whenever he sees his childhood friend Goto-chan, he always feels an urge to do it with him... Was he unconsciously thinking that he wanted to do "that" with him? Since then, whenever Shige sees Goto-chan, he is reminded of "that" and ends up avoiding him... Will the two be able to do "that" within 24 hours? A love comedy about a high-spec math nut and a kuudere childhood friend who long for each other!