Yup, you guys have it right.
(a) friend(s) and you, here together
Notes:
this "you" is a very friendly, informal you, even more than the French "tu," and it's often used between children.
Also, "Tomo" could be the name of a person or character, so the text might mean:
Tomo and you, here together.
But without more context, I couldn't tell you which one it was.
What set off the alarm bells in my mind was that
usually in this context, we would say
Tomo
dachi,
if we meant "friends," not just
Tomo
but it's not impossible that it means "friend(s)" anyway...
Hope it helps!