After a date, Shidou and Sae went to Sae's apartment. But then they heard some noise outside. Zombies. Sae and Shidou had to escape. When they ran to a shopping mall where nobody seemed to be, they hid there. They meet Oliver Aiku who escaped the zombies too. His friends got eaten and now he teams up with Shidou and Sae. But as soon as they wanted to leave the mall, they were attacked by zombies. Unfortunately, Shidou got bitten by a zombie and now slowly turns into one.