The military mind of Sosuke Sagara is spinning, as he starts an investigation of a very curious lunch bandit. But his search is interrupted when his newfound talent is exposed - synchronized swimming!

This underwater soldier might be heads and shoulders above his classmates in the pool, but how will he measure up to Kaname's grandfather, an ex-military man who pays the two a surprise visit? School's back in session and Sosuke is well on his way to becoming head of the class in Full Metal Panic! Volume 7!

Story by Shouji Gatou and art by Retsu Tateo.