Chen Keju, a carefree girl, a girl who would stay in bed in the morning and smash the alarm clock:
Li You, a gentle and elegant girl, a girl who can organize her things neatly.
They met on that day...
Ps: As mentioned above, this is an article about Li You and the new heroine Aju (ie Chen Keju). Shen Qi and Du will appear later, but only in supporting roles.
This article begins when Li You leaves Shi Yu and transfers to a new school, and ends before Unit 6 (Battle of Loyalty).