The penultimate mission. Red Buster vs. Red Buster. Hiromu vs. Enter.
"Preparation and Selection"
The Go-Busters begin to lose hope when Enter becomes more powerful every time they manage to defeat him, especially when he transforms into an evil version of Red Buster. As Hiromu steels his resolve into sacrificing himself for the good of his friends, Masato tries to prepare an alternative.
(I should really marathon the past 14 episodes before next week's finale...)