SecretHimitsuBimil

SecretHimitsuBimil
Digital cover
EP by
Hatchi
ReleasedOctober 1, 2025 (2025-10-01)
Recorded2025
Genres
Length
  • 20:28 (digital)
  • 26:33 (CD)
Languages
  • Japanese
  • English
Labels
Hatchi chronology
Untitled
(2024)		 SecretHimitsuBimil
(2025)
TripleS chronology
Assemble25
(2025)		 SecretHimitsuBimil
(2025)		 Beyond Beauty
(2025)
Singles from SecretHimitsuBimil
  1. "Untitled"
    Released: November 20, 2024 (2024-11-20)
  2. "Password"
    Released: September 17, 2025 (2025-09-17)

SecretHimitsuBimil (Japanese and Korean: Secret秘密비밀) is the debut extended play of the South Korean and Japanese girl group Hatchi, a sub-unit of South Korean girl group TripleS. The sub-unit is composed of members Lee Ji-woo, Kim Chae-yeon, Kim Yoo-yeon, Kim Soo-min, Kotone, Mayu, Park Shi-on, and Kim Chae-won. It was released on October 1, 2025 by Modhaus and distributed by Sony Music Entertainment Japan.

The EP contains nine tracks, including pre-release singles "Untitled" (アンタイトル) and "Password", as well as "### (Hatchi Ver.)", which was an album track from Hatchi's 2024 single album "Untitled". Additionally, "Girls Never Die (Japanese Ver.)" and "Rising (Japanese Ver.)" are only avaliable on physical releases of the EP.

Background and promotion

On September 14, 2024, TripleS announced that they would be forming Hatchi as an eight-member sub-unit meant for Japanese-language releases. Mayu and Park Shi-on were pre-selected as members of Hatchi, while the remaining six were chosen via fan voting. They officially debuted with the single album Untitled on November 20, containing tracks "Untitled" and "### (Hatchi Ver.)" which would later be used as tracks on SecretHimitsuBimil.

At TripleS' concert "A Live 25" at Tokyo Dome City Hall on July 21, 2025, Hatchi announced that they would be releasing their first EP in October.

SecretHimitsuBimil's lead single, "Password", was released on September 17. "Password" is a bright electronic pop song which conveys a theme of wanting to unlock a partner's heart, using technological terms such as "log in" and "Face ID". In the lead-up to the EP's release, Hatchi hosted a YouTube mini-series called "Hatch! Summer Vacation" (Korean: Hatch! 여름방학). SecretHimitsuBimil was officially released on October 1.

After the release of the EP, TripleS held their first fan meeting event in Japan, titled "tripleS ∞! 1st FANMEETING in Japan SSSch∞!" in November 2025. The event featured Japanese radio DJ Masayuki Furuya. On December 1, Hatchi held a joint concert with Japanese pop group Shiritsu Ebisu Chugaku titled "After-School Rock 'n' Roll –HYPER– 2025" (放課後ロッケンロール-HYPER- 2025) to celebrate Shiritsu Ebisu Chugaku's tenth anniversary.

The album track "Tokimetique (トキメティック)" was chosen as the theme song of TV Tokyo drama "I Thought Looks Weren't Everything" (人は見た目じゃないと思ってた).

Track listing

Credits adapted from Spotify.

No.TitleLyricsMusicArrangingLength
1."Password"Chiaki Nagasawa, Saori Nagano, p.e.tChiaki Nagasawa, Saori Nagano, p.e.tp.e.t2:55
2."Headphones (ヘッドフォン)"Mayu WakisakaMayu Wakisaka, jisanparkjisanpark3:00
3."Tokimetique (トキメティック)"Chiaki Nagasawa, SNNJChiaki Nagasawa, SNNJSNNJ2:45
4."TOKYO"ZineePark So-hyun, hymaxPark So-hyun, hymax, Lara Andersson2:29
5."Oshare"Rose BluemingMonoTree, Mayu, AwriiMonoTree3:24
6."Untitled (アンタイトル)"Narahiyori, Sorato, YHEL, Ryo ItoNarahiyori, Sorato, YHEL, Ryo Ito 2:41
7."### - ∞! Ver."Rose Blueminghymax, Hongdi, Kuzzihymax, Hongdi3:10
Total length:20:28
SecretHimitsuBimil — Physical album bonus tracks
No.TitleLyricsMusicArrangingLength
8."Girls Never Die (Japanese Version)"Jaden Jeong, Yumita KondoEL CAPITXN, Vendors, Maria Marcus, Arineh Karimi, BADD, jongsoo kimEL CAPITXN, Vendors (Zenur and Nano), BADD3:28
9."Rising (Japanese Version)"Jaden Jeong, GDLO, YELO, Simple T, Masami KakanumaGDLO, Artonic Waves, YELOGDLO, Artonic Waves2:37
Total length:26:33

Charts

Chart (2025) Peak
position
Japanese Albums (Oricon) 15

References

  1. ↑ 트리플에스, 日 쇼케이스 성료...'트리플에스 핫찌!' 탄생. EDaily via Naver. September 15, 2024. Retrieved September 19, 2024.
  2. ↑ 트리플에스 핫찌!가 그린 특별한 청춘 '언타이틀'...日 '정식 데뷔'. ETNews via Naver. November 20, 2024. Retrieved January 12, 2025.
  3. ↑ Park, Dong-sun (July 21, 2025). 트리플에스, 풀 콘서트 'A LIVE 25' 日 공연 성료…10월 현지유닛 예고 [TripleS, full concert 'A LIVE 25' Japan performance completed... preview for October 2025 local (Japan) unit comeback]. News Culture. Retrieved July 22, 2025.
  4. ↑ Han, A-jin (September 20, 2025). 트리플에스 핫찌!, 日 첫 미니 타이틀 'Password' 선공개 [TripleS Hatchi!, Japanese first mini album title track 'Password' pre-released]. Financial News via Naver. Retrieved September 21, 2025.
  5. ↑ "트리플에스, 日서도 통하네…디멘션 핫찌, 'Password'로 현지 열광 : 네이트 연예". Sports World via Nate News (in Korean). Retrieved 2026-10-21.
  6. 1 2 "SecretHimitsuBimil". Oricon News. Retrieved 2026-10-21.
  7. ↑ "tripleS日本選抜ユニットが1st EPリリース、11月に来日公演も決定". Music Natalie (in Japanese). July 19, 2025. Retrieved October 6, 2025.
  8. ↑ Kim, Sunwoo (2025-12-08). "트리플에스 핫찌, 日 첫 미니 활동 성료". JTBC News (in Korean). Retrieved 2026-10-21.
  9. ↑ "트리플에스 핫찌!, 日 TV 도쿄 새 드라마 오프닝 테마 장식". Sports Gyeonghyang (in Korean). 2025-12-30. Retrieved 2026-10-21.
  10. ↑ "트리플에스 핫찌!, 日 드라마 '오프닝 테마' 꿰찼다!". Busan Financial News (in Korean). 2025-12-29. Retrieved 2026-10-21.
  11. ↑ Listen to tripleS ∞! ＜SecretHimitsuBimil＞ - Album by tripleS | Spotify, 2025-10-01, retrieved 2026-10-21
  12. ↑ Girls Never Die -Japanese Version-, 2025-04-12, retrieved 2026-10-21
  13. ↑ Rising -Japanese Version-, 2025-04-12, retrieved 2026-10-21