Katekin

This manga's strong points: Ecchi scenes, Moderately funny
This manga's weak points: Plot and character development

If we could all agree to be honest for a minute, I think we could agree that we're here searching for a nice little ecchi manga with a sexy nee-san being a tutor for a awkward middle schooler who is rapidly awakening to the idea of recreational sex. If so, I can tell you right now that this manga does deliver the scenarios and the artwork with fairly good execution.However, I came for the ecchi scenes and was genuinely surprised by how much more I enjoyed the humour.

Yes, this is one of those manga where the ecchi scenes are secondary to the plot; which is a damn shame because the plot is incredibly frustrating. The reader may even be able to feel some of the desperate, reckless, urgent mindset of the hormone-addled middle-school protagonist and his few friends. Characters are funny to a certain extent. The nee-san tutor is never truly developed as a character, being instead a sex object in the mind of our protagonist and the few guys who like her. The character who gets the most development is the girl who has a crush on the MC, and hers is also not something worth mentioning.

The plot is pretty cyclical, as expected of this type of manga; but, as I previously mentioned, is very frustrating. This would not be a problem if the ecchi scenes were the centre of focus. However, you will inevitably find yourself drawn back to the story and the story just isn't good enough to sustain interest over 30 or so chapters at a stretch.

BOTTOM LINE: If you're here solely for the ecchi scenes, look elsewhere. There are much better ones out there. If however, you've got some time to burn and (for some inexplicable reason) want to re-live your days as a virgin middle-schooler: go ahead. This won't let you down.