SOS Alliance is a student association of Xianlibei High School, whose full name is translated into Chinese as "Spring Red Club that makes the world more lively". Members include head of delegation harumi, deputy head of delegation Koizumi Itsuki and mascot (? ) Asahina Mikuru, members Kyon and Nagato Youxi.

SOS refers to "Lianggong Spring Day Mission to Make the World More Lively", or "SOS Mission" for short.

The full name is as follows: をぃにりげるためのハルヒの (Sekai Wooini Moriagerutame no Suzuki

The unusual thing about this club is that it exists without a clear purpose and appears completely according to the personal preference of spring. What is even more surprising is that most of the members are not ordinary people.

Spring is a god-like existence in this world. As long as what she thinks, whether it exists or not, will appear in this world. Because of its dangerous characteristics, it attracted the attention of Nagato, an alien, who will be the real Ryukyu and Gu Quan in the future, a ghost. Kyon is an important existence in this world, which can restrain the imagination of spring. These people, who were originally separated from each other, got together by mistake in spring. Since then, on them, one interesting and bizarre story has been staged.

The original work is Tanigawa Ryong's nine light novels, which were later adapted into 14 sentence animation by Kyoto Animation: Melancholy in Spring Palace is popular all over the world.

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