A song Japanese duo monet released over a year ago has passed 10 million YouTube views, carried there by a short-form video trend. ‘Wakacchainai ne’, performed with the Synthesizer V AI voice Hanakuma Chifuyu, had sat at about 200,000 views until around May, according to Roudiam, the company behind distributor narasu.
(Image: Roudiam/narasu)
The trend’s recurring move has creators forming a frame with their hands while images flash through it in time with the song. People have filled it with childhood photos, fashion shots, food, game footage, and their own artwork.
The earliest public version linked to the trend was posted by Japanese creator Zako on May 24th, with voice-synth scene writer Flat crediting Zako with devising the ‘Wakacchainai ne’ format. Similar edits followed, before the track spread into gaming clips, singing covers, and other forms of user-generated content.
On August 6th, Billboard Japan reported that the song had been gaining plays in Japan and overseas since late May. It was the week’s highest new entry on Global Japan Songs Excl. Japan, which ranks Japanese music using streaming and download data from more than 200 countries outside Japan.
By September 14th, Roudiam counted more than 100,000 TikTok videos using the track, which had generated 280 million views between them. It had also been used in more than 200,000 YouTube Shorts.
Much of that TikTok activity is spread across unofficial sound uploads instead of monet’s own. Chartex recorded 28,920 videos using ‘original sound – dream_recall’ by September 16th and 11,404 using a newer sound from @mianano7, compared with 3104 on monet’s listed sound.
(Image: Roudiam/narasu)
Back in Japan, the song was climbing TikTok’s domestic charts too. ORICON’s TikTok Music Chart, which tracks videos created in Japan, had ‘Wakacchainai ne’ at No. 49 for August 6th to 12th, No. 17 the following week, and No. 6 from late August, a position it held for three consecutive weeks. The YouTube Shorts chart shows the same pattern, taking the track from No. 10 for July 31st to August 6th to No. 6 for September 4th to 10th.
‘Wakacchainai ne’ reached No. 5 on ORICON’s Streaming Rapid Rise ranking for August 31st to September 6th, its average daily streams up 12.4% on the previous week, and this week it climbed from No. 18 to No. 12 on Billboard Japan’s Heatseekers Songs chart. Japan’s voice-synth community has taken to it too, with four weeks in a row in the top ten of Billboard Japan’s Niconico VOCALOID SONGS TOP20 from mid-July and a return to No. 8 this week.
Both members commented on the milestone in Roudiam’s announcement. “I’m truly happy that music I started making for myself has reached so many people and been so well received”, said producer Manamu Japan. “I’ll keep putting out new songs, so I’d like each of you to give them at least three listens”.
Vocalist Tasuku put it in gaming terms. “Outside of Momotetsu, this is the first time I’ve ever come face to face with the number 10 million”, he said, referring to the long-running video game series where players travel around buying properties and making their fortunes.
Tasuku isn’t on the viral version, but he did record the song. monet first released ‘Wakacchainai ne’ with his vocals on May 28th, 2025, and put out the Chifuyu edition a week later on June 4th.
Releasing human-vocal and SynthV versions has become a recurring pattern for the duo, who have also issued ‘Doushite Kou Natta!’, ‘Yomichi ni Ki wo Tsukete’, and other songs in both forms. Manamu Japan wrote, composed, arranged, mixed, and mastered the Chifuyu recording and made its video, with artwork by illustrator Uni Uryou.
The song hit 10 million views on the same day monet released their new single, ‘Dame da ne’.
About monet
monet are a Japanese duo comprising Vocaloid producer and songwriter Manamu Japan (ﾏﾅﾑｼﾞｬﾊﾟﾝ) and vocalist Tasuku. Originally active as a band from 2016 to 2019, monet returned in 2024 in their current two-person form. Their recent catalogue moves between J-pop, rock, and Japan's voice-synthesis scene. monet frequently release parallel versions of the same song, with one sung by Tasuku and another using a synthesized singing voice, most often the Synthesizer V AI singing voice Hanakuma Chifuyu. Manamu Japan handles much of the project's songwriting, composition, arrangement, mixing, mastering, and video production. monet reached a wider international audience in 2026 through the Hanakuma Chifuyu version of '分かっちゃいないね (Wakacchainai ne)'. Released in June 2025, the song spent almost a year at relatively modest numbers before illustration-led UGC and short-form videos spread internationally. Its official music video passed 10 million YouTube views in September 2026, while the track also entered Japanese TikTok, YouTube Shorts, streaming, and emerging-song charts.
monet feat. Hanakuma Chifuyu
分かっちゃいないね (Wakacchainai ne)
Release Date: 04/06/2025
Label: monet
Stream: Links
