 If you liked
Shuumatsu Touring
|
 ...then you might like
Manatsu no Grey Goo
|
A love of sci-fi and technology runs through both of these manga and they both have emphasis on apocalyptic settings. While Shuumatsu Touring focuses more on two central female characters, Grey Goo has three to begin with and trades some of the sci-fi depth for more comedy. While Midsummer Grey Goo does have bikes, it focuses more on military vehicles.