Sachi's Monstrous Appetite Vol. 4 (manga)

The massive kanetsuki watari has managed to take Makie’s friends and even Miss Manager. Onigashima’s ferocious attacks can only buy time as Makie and Sachi are tasked with a dangerous plan that requires Sachi to take the biggest of bites. But facing such a giant watari comes at a cost. After fighting the kanetsuki, Sachi’s energy is depleted and she can no longer maintain her human form. She and Makie journey to Sachi’s hometown to search for a way to replenish her energy, but something terrible awaits their arrival…