The publisher has opened a site for the shounen light novel:
http://www.fujimishobo.co.jp/sp/ninomiya/
Some characters:
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二ノ宮峻護
Ninomiya Shungo
Protagonist of this light novel.
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月村真由
Tsukimura Mayu
Main heroine.
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北条麗華
Houjou Reika
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二ノ宮涼子
Ninomiya Ryouko
Shungo's older sister.
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月村美樹彦
Tsukimura Mikihiko
Mayu's older brother.
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Some merchandise:
Figurines:
http://www.fujimishobo.co.jp/sp/ninomiya/01.html
Drama CD:
http://www.chara-ani.com/details.asp?prdid=FU2608020
A2 clear poster:
http://www.chara-ani.com/details.asp?prdid=K13509011