Nijiiro Days follows the colorful lives and romantic relationships of four high school boys—Natsuki Hashiba, a dreamer with delusions of love; Tomoya Matsunaga, a narcissistic playboy who has multiple girlfriends; Keiichi Katakura, a kinky sadist who always carries a whip; and Tsuyoshi Naoe, an otaku who has a cosplaying girlfriend.
Unfortunately the movie Rainbow Days is not yet available on HBO Max.
| Directing | Ken Iizuka | Director |
| Writing | Minami Mizuno | Comic Book |
| Writing | Rika Nezu | Screenplay |
| Production | Isao Takeda | Executive Producer |
| Lighting | HONMA Hiroumi | Gaffer |
| Art | 野村哲也 | Decorator |
| Production | Tadashi Osumi | Executive Producer |
