If we're going to suspect Kumasawa though I want to think she's a talented voice actor. She was involved with acting out that argument with Kinzo so that's a hint I guess. But I could also say I wouldn't put it past her since she seems to be good at many kind of pranks.
Battler heard the calls himself, but I guess we can't deny Kumasawa would be capable of that even though the hints are scarce. I guess I want to argue that the calls in episode 4 were all an act by her. The calls themselves don't really match the characters.
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