☆ The Heaven's Library is connected to Tenpou's private library. To enter there secretly, down Tenpou's private library there is a tunnel that only few western soldiers use. Even if you wasted time gathering a squad, they can leave the city immediately. Also, by using that secret passage, Tenpou borrows for free or rather steals books. ☆ The rebellions ---Konzen, Goku, Kenren and Tenpou--- along with their hostage Goujun used that path in order travel way to Heavenly Palace secretly.