Responses
I just finished this one and it looks like there is a sequel. I haven't read the sequel yet, but hopefully it has a better ending: Thunderbolt Boys: Excite. http://www.mangago.me/read-manga/thunderbolt_boys_excite/
I'd say a must read but because it doesn't end and it just leaves you wanting more it leaves you sad and unsatisfied. Wish there was more.