Elfi belongs to a close-knit team of elves who live in a big city. Sneaking between tall buildings, they provide their little help to the people living there, and a seemingly ordinary search for a lost mascot becomes pure pleasure for them. One day, however, it turns out that in the same metropolis there is a gang of other elves who are famous for using the latest technologies and are leaders in fun and seeking strong sensations. One of the representatives of the new friends is the youngest in the group, Bo, with whom Elfi befriends. Will the meeting of these two be able to reconcile the two elven clans after more than 250 years? The little heroes will see the great power that friendship hides!