A chart-topping single produced by one of its own members, marking the group's fifth No. 1 hit on Japan's most prestigious music chart, Number_i's "3XL" is proof that these former boy-band members have evolved into full-fledged artists with creative vision. That same week, girl group XG claimed the album chart throne with their debut full-length. Two Japan-based acts, two different strategies, one shared moment at the top.

Number_i's "3XL", A Love Song That Conquered the Charts

On the Billboard JAPAN Hot 100 chart released February 4, 2026 (tracking period: January 26–February 1), Number_i's new single "3XL" debuted at No. 1.

The numbers were dominant: 75,075 downloads (No. 1 in downloads), No. 3 in video views with nearly 5.5 million plays, No. 10 in streaming, and No. 1 in radio airplay. This marks Number_i's fifth song to reach the top of the JAPAN Hot 100 (sixth time overall), following previous chart-toppers "Mikakukin Ryouiki," "GOD_i," "INZM," and "GOAT."

For a group barely two years into their career, five No. 1 singles is an extraordinary pace that speaks to both their popularity and the quality of their releases.

What Makes "3XL" Special

The title "3XL" refers to the clothing size, but in the song's lyrics, it serves as a metaphor, a love that was "too big to wear" at the time, representing feelings too overwhelming for a younger, less mature self to handle. The catchy hook translates roughly as "This love is way too big / I want to tell you, 3× Love / Looking so good it fits, 3XL."

This is notably Number_i's first love song released as a lead single. Since their debut, the group had been known for hip-hop and EDM-influenced tracks. Proving they can dominate the charts with a pop love song demonstrates impressive musical versatility.

The music video, released simultaneously on YouTube, hit No. 1 on YouTube Charts' Japan Daily Music Video ranking and No. 6 on the worldwide daily ranking on its release day. It reached 10 million views in a record-breaking 1 day and 50 minutes, and surpassed 15 million views within five days. Fans have praised its cinematic quality and rewatchable storytelling.

Sho Hirano, From Performer to Producer

Sho Hirano is one of the biggest names in Japanese entertainment. He was previously a member of King & Prince, one of the most popular boy bands under the former Johnny & Associates talent agency, Japan's dominant pop idol empire for decades. In 2023, Hirano, along with Yuta Jinguji and Yuta Kishi, left King & Prince and joined TOBE, a new agency founded by former Johnny's executive Hideaki Takizawa. Together, they formed Number_i.

The group set their sights on global expansion from day one. In 2024, they performed at the Coachella Valley Music and Arts Festival in California through the 88rising stage, a platform for introducing Asian artists to American audiences. Their debut single "GOAT" (Greatest Of All Time) went viral, reaching No. 1 on the U.S. iTunes Hip-Hop chart.

With "3XL," Hirano is credited as producer, a significant evolution. The release date, January 29, was also his 29th birthday, adding a personal dimension to the milestone. The chart success validates Hirano not just as a charismatic frontman but as a creative force capable of crafting hit music.

XG, The Other Chart-Topper of the Same Week

On the same chart week, girl group XG's debut full album THE CORE - 核 (kaku, meaning "core" or "nucleus") claimed the No. 1 spot on the Billboard JAPAN Hot Albums chart.

XG (short for "Xtraordinary Genes") is a seven-member group of Japanese artists who trained in South Korea and debuted in 2022. They perform primarily in English and have built their brand around global accessibility from the start. Their approach differs fundamentally from traditional Japanese pop, they create music designed to compete on a worldwide stage.

The results have been remarkable. THE CORE - 核 debuted at No. 93 on the U.S. Billboard 200, marking their first top-100 entry on America's main album chart. The lead single "HYPNOTIZE" topped the "Global Japan Songs Excl. Japan" chart, meaning it was literally the most-streamed Japanese song worldwide outside Japan. The album charted on Apple Music's Albums Top 200 in 68 countries and territories.

In 2025, XG headlined the Sahara Stage at the Coachella Festival, the first Japanese act to do so, performing a full 12-song set. They completed a world tour spanning 47 shows across 35 cities in 18 countries. Their YouTube channel now has over 4 million subscribers.

Two Strategies for Global Ambition

Number_i and XG reaching the top of their respective charts in the same week is a symbolic moment for Japan's music industry.

Their approaches represent two distinct models. Number_i builds from a massive domestic fanbase (iLYs, their fan name), leveraging Japan's enthusiastic idol culture while gradually expanding internationally. Their YouTube subscriber count of around 960,000 reflects a concentrated but passionate Japanese audience.

XG, by contrast, was designed for global consumption from inception. English-language tracks, K-pop-style training methodology, and a touring strategy that prioritizes international markets have given them a different kind of reach. Their 4 million+ YouTube subscribers come from around the world.

Neither approach is inherently superior. Number_i demonstrates that Japanese domestic stardom can fuel chart dominance and create a launchpad for international growth. XG proves that Japanese artists can compete head-to-head in the global pop arena when equipped with the right strategy.

Together, they represent the diverse potential of Japan's music industry in 2026, no longer limited to a single path toward international recognition.

Number_i's "3XL" topped the comprehensive chart with a member-produced song, while XG's global breakthrough shows Japan-based artists can cross language and genre lines to reach listeners worldwide. Two very different acts, two strategies, both at the top of the charts in the same week.

How does your country approach music exports? When a domestic artist breaks through internationally, how does the public react? Are there similar debates about "domestic popularity vs. global reach" in your music scene? We'd love to hear about your country's music landscape.

References