@Samadhi_Overdrive
I'd say in this case Hamada is part of an audience that's fond of familiar
shounen story elements, but is looking for action and
ecchi on a more adult path than, say, To LOVE-Ru, but not so unrelenting as Attack on Titan or Berserk, so that's the story he's telling. The early chapters are more in line with the typical
shounen type of developments, but once the machinations of the Mayoiga crew start to show, the story starts to change, and Kazuya starts to change with it.
The elements of the whole story are hinted at in the very first chapter, and by the time Kazuya arrives at Tsuzura we know most of the important stuff, and Kazuya knows what he needs to do. Everything since then is geared to getting him ready, with enough excuses for
ecchi to keep Hamada motivated through endless wrist-breaking hours of drawing.