SOS Group is a student association in Gaobei, whose full name is translated into Chinese as "Haruhong Spring Day Group to make the world more lively". Members include head of delegation harumi, deputy head of delegation Koizumi Itsuki and mascot (? ) stayed in Binet.Alfred. Alfred nine years, as well as members Kyon and Nagato Youxi.

SOS refers to "Lianggong Spring Day Mission to Make the World More Lively", or "SOS Mission" for short. (Secai in the world, more Oini, Aria 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 alien Nagato, futurist Shi Jiuliu and ghost Gu Quan. Kyon is an important existence in this world, which can restrain the imagination of spring. These people who were originally separated from each other were brought together by spring. Since then, on them, one interesting and bizarre story has been staged.

The original works are eight light novels [url/] written by Tanigawa Ryong, which were later adapted into 14 sentence animation: melancholy in spring [url/], which is popular all over the world.