There are multiple manga series that share the title Dandelion, making it impossible to provide a single synopsis without additional clarification.

Several distinct works have been published under this name, including a one-shot by Hideaki Sorachi (creator of Gintama) about angels guiding earthbound spirits in the Japanese Angel Federation; a shōjo series by Yuu Watase, also known as Imadoki!, about a country girl who starts a gardening club at an elite academy; a horror manga by Akaboshi Yu involving disappearances tied to a shrine; and a detective story by Ochiai Naoyuki centered on young cyber investigators. Additional series such as Castle Town Dandelion by Kasuga Ayumu feature a royal family with superpowers whose daily lives are broadcast nationwide.

To provide an accurate synopsis, please specify the author, artist, or provide additional identifying details about the particular Dandelion manga you are referring to.