Books by Koushi Tachibana

Twin Spirits mean double the trouble. Summer break is just around the corner, and it’s time for Raizen High School’s class trip to Arubi Island. While the other students gear up for a bit of fun at the beach, though, Shido has no time to relax! As soon as his class reaches its destination, he immediately encounters twin Spirits Kaguya and Yuzuru. Now, he’s wrapped up in some “final battle” where the one who seduces him first will be named the victor! But this time, he has no backup from Ratatoskr. Can he make it out alive and save the twins from their cursed fate?!

A spirit in flames, a town on fire… Shido was determined to save Kurumi and Mana. He simply had to. At the critical moment, though, he found himself immobilized, unable to keep his promise. Had Kotori Itsuka not shown up at the last second, everything would have been over... Nevertheless, Shido feels like his world has come crashing down, especially after discovering his little sister is a Spirit, too... Now he’s been called to save her using the only method he knows: taking her on a date and making her fall for him. He needs to act fast—because he only has one day to complete this seemingly impossible mission!