Looking at Tsukasa in the cover, she really looks a lot like Hina from Hayate the Combat Butler.
And speaking of Hayate, was that him and Nagi in the kisses part?! Goddammit I'm not finished reading it yet. Don't tell me he went with the first girl cliché? Did Nagi win? Also that felt very wrong, considering how Nagi is basically a loli in the series.