I'm the Strongest in This Zombie World, but I Can't Beat This Girl!, Vol. 2

Yuuma Kousaka, a high-schooler resistant to the zombie virus, has found himself in a situation where he has to periodically kiss Mai Tsukishiro to stop her from turning into a zombie. They come across two more survivors—a pair of college girls—and Yuuma tries to hide Mai’s zombification from them. However, after they see the pair, Yuuma and Mai are forced to keep up the façade and pretend to be in a relationship…something that his real girlfriend, Hinata Hyuuga, does not find entertaining.

[From Yen Press]