“When you realize that bands that were listening to us now do crazier shit than us, it’s like, we’ve got to get a little crazier too,” Masato laughs.

Nearly two decades into coldrain’s career, slowing down clearly isn’t part of the plan. If anything, watching a new generation of Japanese bands push heavy music forward has encouraged the Nagoya, Japan, quintet to push themselves even harder. That mantra runs throughout OPTIMIZE = OPTDEMISE, coldrain’s eighth album, out now via Century Media Records. Almost twenty years after forming in Nagoya, vocalist Masato, guitarists Y.K.C and Sugi, bassist RxYxO, and drummer Katsuma remain the same five musicians who started coldrain in 2007.

But underneath all that intensity is a decidedly modern anxiety. For Masato, the rapid advance of artificial intelligence raises a bigger question than whether technology can write a song, create an image, or imitate a person. It’s what happens to human creativity when we stop thinking for ourselves.

The result is coldrain with everything they do best cranked to 11: heavier riffs, harder-hitting drums, bigger instrumentals, catchier hooks, and considerably more edge. Some tracks were even self-produced, giving the band more room to follow their instincts, embrace imperfections, and let some genuine human rawness into the process that AI can’t replicate. Part of that energy came from an unexpected source: younger Japanese bands today who grew up listening to them.

“When you realize that bands that were listening to us do crazier shit than us, it’s like, we’ve got to get a little crazier too,” Masato laughs. “So we decided just to go more dumb with it.”

That doesn’t mean abandoning the enormous hooks that have always balanced coldrain’s aggression. Masato says the group still approaches every song as though it could be a single or an anime opening. “We’re not afraid to release any of the songs as a single,” he says. “That’s the mentality.” And every song on OPTIMIZE = OPTDEMISE is exactly that of lead single quality material.

It’s a balance that has long made coldrain difficult to pin down. Depending on who you ask, their sound can evoke the arena-sized ambition of Linkin Park and Papa Roach, the emotional immediacy of My Chemical Romance, or the scream-to-clean infectious hooks to firey breakdowns of metalcore bands like Memphis May Fire. Masato sees truth in all of those comparisons, with coldrain growing from the same collision of nu-metal, post-hardcore, and massive rock choruses. Crushing vocals and riffs collide with arena-sized anthems across 12 tracks on this album, including “EX-HUMANITY,” “INCOMPLETE” and “POISON,” the latter featuring The Used vocalist Bert McCracken.

For coldrain, that collaboration was nearly two decades in the making.

“From day one, we’ve always tried to have at least one song on the album sound like The Used,” Masato says. After touring Australia alongside The Used and Papa Roach, another foundational influence, coldrain finally had the relationship (and the right song) to make it happen. Masato originally recorded “POISON” himself, wanting to make sure the track could stand on its own before sending the finished song to McCracken.

When asked about having their music discovered by anime fans, he recalls, “You didn’t want to be labelled as an anime song band in Japan,” Masato remembers, but growing older made him realize how many songs permanently lodged in his own memory came from anime. Eventually, that influence began shaping how coldrain writes, even approaching songs around the immediate impact of a 90-second anime opening. That relationship has since become far more collaborative, including Masato’s solo contribution to titles like Bastard!! -Heavy Metal, Dark Fantasy to the ultra-popular shonen Jujutsu Kaisen, where the animation itself responded to his performance. “When I tracked the vocals, they changed the anime scene to fit my scream,” he recalls, explaining that he recorded while watching early sketches of the sequence. “That was really cool.”

There’s also a curious cultural paradox: International fans increasingly want to hear coldrain sing in Japanese, while Japanese fans have long associated them with English. When Masato tested adding Japanese vocals to a song, he remembers, “In Japan people were like, ‘Why are you singing in Japanese now?’ But internationally people were like, ‘Whoa, that’s awesome.’

Behind the album’s explosive sound, however, is a much more uneasy question about where technology is taking humanity. Masato isn’t interested in making a blanket anti-AI statement. Instead, he draws a line between technology enhancing an original idea and technology generating that idea for us. He references the Japanese concept of moving from “zero to one”: the crucial moment when something genuinely new is conceived.

That philosophy extends beyond AI into the increasingly numbers-driven realities of being a modern band. Algorithms reward streams, followers, reach and constant optimization, but Masato questions what those numbers actually represent. “You can have a million people listen to your songs,” he says. “But it’s all a matter of—You can stick your hand out to anyone, but who’s going to shake that hand? Who’s going to come to your show? Who’s going to have that connection?”

For Masato, 10,000 people genuinely connecting with coldrain at a show means more than a million passive streams. It’s fitting for a band whose rise has been remarkably gradual. Masato says coldrain never experienced one enormous breakthrough. Instead, they climbed “a step at a time,” with the same five members sharing the journey.

“The music is what connects us like brothers now,” he says. “We don’t have to communicate on a daily basis to be brothers.”

Nearly 20 years into coldrain’s career, OPTIMIZE = OPTDEMISE proves there are still some things you can’t optimize: instinct, connection, and five musicians getting in a room together, still chasing the kind of energy no algorithm could manufacture.

OPTIMIZE=OPTDEMISE is out now. Get it here. 

Photo by Maciej Kucia