Maybe... it's just a suicidal thought? Like Ishida at the bridge in Koe no Katachi? If not, maybe Pisen grabs him out of nowhere? I feel for my guy, the absolute dumbass he is.
Maru is probably the most punchable character I've seen in months. Isami split - that's fair, they kinda knew it was gonna happen, when they saw each other last time. But yeah - there's no "ordinary life" on the menu, not anymore.