# Attack on Titan collaboration at Nijigen no Mori > Live situation record from CLSTR: https://clstr.news/situations/attack-on-titan-collaboration-at-nijigen-no-mori > Updated: 2026-09-17T02:00:00.000Z. Sources: 7. Developments: 2. The Japan Anniversary Association officially designated September 9 as ‘Attack on Titan Day’ to mark the anniversary of the series’ serialization. To celebrate, a collaboration event is being held at the Nijigen no Mori theme park on Awaji Island in Hyogo Prefecture. The collaboration includes daytime activities such as a character stamp rally and ‘Mystery Quests’ themed around Hange Zoë, as well as exclusive merchandise and themed food. The night event, titled ‘Attack on Titan THE NIGHT WALK -Beyond the Walls-’, utilizes projection mapping and immersive soundscapes across a 1.2km forest walk. As the collaboration enters its final three months, scheduled to run until December 13, 2026, additional celebrations have been introduced. These include a fifth character birthday event honoring Erwin Smith and a promotion starting October 14, 2026, where visitors to the night walk can receive limited-edition stickers featuring Hange Zoë. ## Timeline ### 2026-09-17: Nijigen no Mori hosts ‘Attack on Titan’ birthday event on Awaji Island Nijigen no Mori on Awaji Island is hosting a limited-edition birthday celebration for ‘Attack on Titan’ character Erwin Smith, featuring exclusive stickers and themed attractions. 3 sources. https://clstr.news/cluster/nijigen-no-mori-hosts-attack-on-titan-birthday-event-on-awaji-island ### 2026-09-09: Attack on Titan Day officially designated for September 9 September 9 is officially designated as ‘Attack on Titan Day’ in Japan, celebrated with a major collaboration event at Nijigen no Mori featuring immersive night walks and themed puzzles. 6 sources. https://clstr.news/cluster/attack-on-titan-day-officially-designated-for-september-9 --- Cite as: Attack on Titan collaboration at Nijigen no Mori. CLSTR, https://clstr.news/situations/attack-on-titan-collaboration-at-nijigen-no-mori