This story is a sequel to Kingdom Hearts F.I.M: Rise of The Elements
Can be read independently of that story, however.
Spike is an orphan who's hated and ostracized for being different. Fed up with the people of his home, Spike decides to leave in order to find a place where he's accepted. However, the day before he's set to leave, Spike comes across a certain lonely girl who will change his destiny forever.
Travel back 10 years from the start of Rise of the Elements and experience the very beginning of Spike's adventures with Twilight and the others. Discover the truth of Spike's origins as he struggles to understand what having a family really means.