Zombie-Loan Vol 5

From the Yen Press edition

When Shito is kidnapped, Chika, Michiru, and the group's newest addition - the axeman Sotetsu - don't hesitate to rescue their tall, dark, and grumpy friend. But the battle leaves them beat afterward, and Koyomi decides some all-night karaoke is the best cure. Little do they know that the very people behind all the illegal zombie activity are getting their groove on in the very next room!

Source: Yen Press