"You gotta eat, man. Please."
A little overlooked fact by a lot of fans: after Mondo died, Naegi states that it’s easy to tell Ishimaru hasn’t been sleeping or eating. In fact, the only reason Kirigiri allowed Ishimaru near the locker room was because Naegi said he wanted to make sure Ishimaru didn’t starve.
(Another little fun fact: when an animal wants to die, it stops eating.)