Ye Linxuan started her college life with great expectations and got acquainted with three girls with different personalities in the dormitory. But after slowly getting in touch with them, she discovered that her roommates were planning to use a time machine to travel through time and space! This is not a childish game for girls, and this plan eventually involves Ye Linxuan. She has questions and begins to investigate. What secrets are hidden behind this seemingly ridiculous plan...? Dear readers, let's see how these four people compose a song of four seasons in different time and space. (What the heck... We're not particularly good at copywriting, so let's just make do with it for now>