Delulu Pack is the second extended play by South Korean girl group KiiiKiii. It was released by Starship Entertainment on January 26, 2026, and contains six tracks, including the pre-release single "To Me from Me" and the lead single "404 (New Era)".
On January 1, 2026, Starship Entertainment announced that KiiiKiii would release new music at the end of the month. On January 6, upon the release of concept photos, it was confirmed that the group's second extended play Delulu Pack would be released on January 26. The track film for one of the tracks "Delulu" was released on January 12. Concept photos were released on January 13 and 16, when the lead single was confirmed to be titled "404 (New Era)". On January 18, a highlight medley video of the album's tracks was released, which confirmed that the song "To Me from Me", previously released in November 2025 as an OST, would be included. A short preview of "404 (New Era)" was released on TikTok the following day. More concept photos and the music video teaser for "404 (New Era)" were released on January 22 and 23, respectively. The extended play was released alongside the music video for "404 (New Era)" on January 26.