In Season 2, Episode 17.

Plot summary: The music room where the light music club performs cannot be used due to water leakage. When looking for a new venue for the activities, the rhythm team accidentally complained about the lyrics of Mio's new song. Under the suggestion, everyone decided to go back and try to make one. Unfortunately, the omnipotent sister Xiu fell ill the next day!

The condition is the same as when Wei had a cold, with a high fever that persisted. So the Qingyin Club came to Wei's house to help take care of You. At this time, Wei Cai realized that it was not easy for his sister to take care of him. That night, after preparing breakfast for You, Wei wrote the lyrics to U&I and fell asleep on the desk. At the department meeting the next day, everyone unanimously decided to adopt Yui's lyrics. Wei said that she wrote it with the feeling of "you only learn to cherish after you lose it".

Extended information:

The plot synopsis of the second episode of "Light Sound Girls"——

The story tells the story of a four-person girl group from Sakuragaoka High School. The story of the soon-to-be-disbanded light music club starting from scratch. Yui Hirasawa, a first-year high school student, mistook "light music" for "light, simple music." Since she was praised by her teacher for playing castanets when she was a child, she came up with the idea of ??applying to join the club.

As for the "Light Music Club" of Sakuragaoka High School, all the original members graduated and left the school. At this time, the only new members of the Light Music Club were Akiyama Mio, Tai Naka Ritsu, and the daughter-in-law Kotobuki who was introduced? Three people, but the ministry is about to be abolished because it cannot meet the minimum number of members of at least four.

So, these four first-year high school girls got together by chance, and they had guitarist Yui Hirasawa, bassist Mio Akiyama, drummer Ritsu Tai, and keyboardist Kotobuki?, Qingyin. The story of the department also unfolds.