As my mind remember now, Minami received the bike from Akira Daimon. When he received the bike, he promised to Akira to give back the bike when he finished his mission against Gorgom. :shrug:
Or was Akira who said to Minami when the finished his mission, he could give back the bike? :eyebrow:
I think was Akira whom sad to Isamu to take the bike!
Words comes to my mind, when Minami said that, Daimon could pilot so good the bike that he could use it to fight against the evil, and Daimon refuse this and said something to Minami to keep the bike until he could finish his mission. And what Minami did: Kept the bike. But as i remember, Minami make a deal with Akira: When he finished his mission, he will give back the bike to his true owner: Akira.