At Belfast, Maddy Cummings and Kelci Faulkingham each scored a first-half goal en route to the victory for the Lions.
Cummings added a second-half goal while Kylie Nelson chipped in with two. Kristine Mehuren added a goal while Savana Wood contributed an assist and Faulkingham notched two. Madison Littlefield finished with four saves on four shots for 3-4 Belfast.
For 3-4 MCI of Pittsfield, Mikayla Carr and Courtney Sprague combined on five saves against 11 shots.