Banana Fish's central weapon is a system—someone ingests it, someone else operates it, and the victim loses volition.

But here's what matters: the anime's visual language doesn't care about the victim's internal experience, only the network.

Every major scene involving Banana Fish's effects is shot through frames within frames—windows, doorways, security monitors, split screens—turning bodies into data points rather than sufferers. When Ash is administered the drug in Episode 18, the scene doesn't linger on his psychological dissolution but cuts between his position in the room, Golzine's position elsewhere, and the intermediary spaces between them.

This is 2018 thinking layered onto 1985 source material. Akimi Yoshida's original manga was about chemical vulnerability and coercive control—the paranoia of the Cold War drug experiment—but the anime keeps that plot and photographs it through a different nightmare: infrastructure collapse. Ash's final scene—trapped in the library, unable to reach Eiji despite phones and proximity—isn't tragic because he's alone but because the system designed to connect him fails. He has access to communication technology, yet the architecture simply won't route his signal.

The production design confirms this obsession: telephone cords, electrical lines, surveillance equipment, and building layouts receive the same compositional weight as character faces, so when someone is cornered, the show frames them as a blocked node, not a trapped person—revealing what 2018 understood about control that 1985 didn't have to.