Last Idol Leads, BTS & Halsey's 'Boy With Luv' Breaks Into Top 10 on Japan Hot 100

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Courtesy of Billboard Japan
Last Idol

The No. 1 song on the latest Billboard Japan Hot 100, dated April 15 to 21, is "Otona Survivor" by the 52-member idol group Last Idol, born from an audition program.

The single sold 88,762 copies and led the physical sales metric, debuting the song at the top spot by a mere 11-point difference between the No. 2 song, "Harunohi" by singer-songwriter Aimyon.

"Harunohi" rose 7-2 this week, leading downloads, radio airplay and look-ups, while also performing well in other metrics such as physical sales (No. 9) and streaming (No. 3).

While barely missing the No. 1 spot, Aimyon has landed eight songs on the Japan Hot 100 this week, including "Marigold," which stays at No. 3 for the third consecutive week. The release of "Harunohi" has boosted downloads and streaming for "Marigold," which had been on a gradual decline until last week: Downloads are up by about 1,000 units to 15,554 units, while streaming is up by about 170,000 streams to 3,606,930 this week.

BTS's "Boy With Luv" featuring Halsey enters the top 10, rising to No. 7 after debuting at No. 13 last week. The song surpassed "Harunohi" in streaming (No. 2) with 2,608,040 streams, and beat Kenshi Yonezu's "Lemon" to top the video views metric with 4,923,346 views.

The song lacks physical sales points as it is currently only included on their recent album, Map of the Soul: Persona, so the fact that it broke into the top 10 without this metric reflects the K-pop super group's popularity in Japan.

The Billboard Japan Hot 100 combines physical and digital sales, radio airplay, Twitter mentions, YouTube and GYAO! video views, Gracenote look-ups and audio streams from Amazon Music Unlimited, Apple Music, AWA, Google Play Music, KKBOX, LINE MUSIC, Rakuten Music, RecMusic provided by Gfk Japan, as well as dHits and Uta Pass, and karaoke data from Daiichikosho and XING.

Billboard Japan Hot 100 Top 10 (dated April 15 to 21)
1. [-] Otona Survivor / Last Idol (88,762 copies / none / none)
2. [7] Harunohi / Aimyon (9,030 copies / 31,980 downloads / 2,367,696 streams)
3. [3] Marigold / Aimyon (none / 15,554 downloads / 3,606,930 streams)
4. [36] Ichirinso / Sayaka Yamamoto (31,338 copies / 8,478 downloads / none)
5. [4] Lemon / Kenshi Yonezu (3,446 copies / 21,319 downloads / none)
6. [-] Brand New Parade / GANG PARADE (55,319 copies / none / none) 
7. [13] Boy With Luv feat. Halsey / BTS (none / 4,176 downloads / 2,608,040 streams)
8. [8] Kyun / Hinatazaka46 (16,106 copies / 3,555 downloads / 712,533 streams)
9. [6] Kill This Love / BLACKPINK (none / 4,410 downloads / 1,575,691 streams)
10. [15] Hakujitsu / King Gnu (none / 6,228 downloads / 1,770,353 streams)

[ ]: Position last week.
( ): Physical sales / downloads / streams (Top 50 only)