After Returning from Summer

When the senior year of high school starts in 2024, art student Qi Xueyu and grade number one Shen Zhihuai become roommates. One time, she mistakenly took the wrong question book and drew a crooked tower - which was actually a memory mark sealed by her own hands when she was ten years old. Lin Xi, her friend who had disappeared for eight years, suddenly returned and took her back to the old water tower. The contract expired at the age of eighteen, and the dusty wooden box was waiting for her to open it. What happened that summer? Every stroke she made was sending answers back.