Infinite Stratos: Volume 7

“Please! Take care of my sister!” Ichika doesn't know what to do about Tatenashi's sudden request, but what he can do is take on the semifinals of the all-years tag-team tournament alongside her little sister, Tatenashi Kanzashi. What he can't, or at least doesn't want to do, is explain why he's on a date with someone the other girls don't know of. Will Kanzashi end up with him? Will Tatenashi and Houki stomp their way to a victory? The sparks of love fly between two sisters in the seventh volume of a high-speed school battle romantic comedy!

[From J-Novel Club]