Congratulation! You have become one of the Seven Wonders of the School!
Yes, this book is centered a high school boy named Nakazaki getting involved in the Seven Wonders.
The British Ministry of Information once spread this message: Keep Calm and Carry On - which this book is emphasise on. It would be better to letting go of the past and face the future in a meaningful way.
This is the overall story, do not open if you don't want to be spoiled:
The story structure itself is very interesting as it has the ability to switch perspective of the character as mostly mention 'Asakura' until this ‘Asakura' in certain chapter is actually 'Kaho', which it will be revealed in the final chapter, which in short, tricking the readers. By the way, the creator of Kino's Journey, Keiichi Sigsawa has putting a summary review by saying: "I WAS TRICKED!". Also this book was won Gold Prize under Dengeki Novel Prize in 2013.
Overall, this novel is quite short, straightforward and brings the message which I have mentioned above. Highly recommended for the novel readers who prefer simplicity.
*The book I read was translated and published by Kadokawa Taiwan Corporation.