From CoroCoro Ltd.:

Geo is grieving the disappearance of his father and questioning the unusual partnership he has gained with the FM-ian Omega-Xis. By combining their powers, they are able to transform into the EM Wave Human named Mega Man and battle crime. Geo soon learns of the Wave Coliseum, a tournament that awards the champion a power known as Star Force. Geo believes this power will allow him to travel to space and find his father, so he enters the tournament. However, complications occur when one of the competitors, Gemini Spark, steals the Star Force in order to revive Andromeda, the king of the FMians. This story arc concludes with Mega Man discovering that Andromeda and his father Kelvin had fused as a single EM Wave Human. Defeating Andromeda, Kelvin is freed and returns to Earth to live with his family and new FMian friends.