鼓動の絆 | Kodou no Kizuna | Heartbeat Bond
By: GLARELY
Vocal: Lily
Album: n/a

Nico Nico Douga, youtube (subbed)

There's also a Miku version of this song, also by GLARELY. That one came out after the Lily version, but the Lily one has a much better vocal, imo.

( Lyrics )