red ball with a man face with it

"I" returns home, takes a shower, and emerges totally naked, irritated by the composure of his good-for-nothing friend "Masuda" and venting his anger. "Mom", on the other hand, is totally fine. One moment she's sleeping like a log and snoring loudly, the next she's doing a funny dance in the altar room. In comparison, what is "I" so angry about? A movie boy's delusion, engulfing his beloved mother and his cinema buddy, transforms into a "red ball" that explodes inside his mind.