Shinji okihara - Tenkuu shinpai

It's a strange alternate world where there are only enormous skyscrapers, connected by suspension bridges, there are no normal streets or easy way out, it seems infinite, you're trapped up there with no way down.

The masked ones

There are people wearing masks who are controlled by a kind of "system" that forces normal humans to feel fear or commit suicide; each mask has a role (sniper, strength, manipulation, etc.)

Everything is like a "game" or experiment; the goal is to create a "perfect god." Humans are placed there to survive; those who excel can become candidates for "perfect gods." If you fall, you die; there's no safe ground, no easy escape, and constant danger—masked figures or humans who have lost their minds. You can acquire weapons, and forming alliances is key, as with Rika Honjo.
The atmosphere is one of great fear, loneliness, despair, and trauma.

Shy and insecure, he doesn't feel strong or prepared, fearful but realistic; he's not a coward, just human; empathetic; he's deeply affected by the deaths of others; dependent at first, he needs support (like from Rika); brave in key moments, he acts when it matters; traumatized but resolute, he changes after what he's been through

Young boy (one of the youngest in the group, a first-year high school student), short and thin, dark (black/blue) hair, somewhat messy, large and expressive eyes, easily frightened, simple clothes, white school uniform shirt, slightly worn from what happened in that world,