After surviving a number of battles together, Sakuya and Shinichirou have grown very close. Then, Shinichirou gets the a katana, and wants to train to help Sakuya. Just when everything seems to be going well, a smoke monsters appears in the subways and Sakuya and the gang head to get rid of it.
Please solve the math problem below to unlock download mirrors for ISUCA.
Links are proxied and may take a moment to start.