The biggest problem I have with this manga, is the horrid... uke-fication of Aki as the manga progresses.
Initially, it is made clear just how capable and strong Aki is, how dangerous he can be, if he wants to. And - aside from the romantic feelings - it is clear Ueda respects him for it. However, as you continue to read through the chapters, Aki devolves into some sort of horny damsel in distress, while Ueda is being pictured as more and more manly, more invincibly heroc. Which just gets more and more prevelant, and so, frustrating the more I read.