MIXI, Inc. announced the first collaboration between its smartphone RPG 'Monster Strike' and the TV anime 'SAKAMOTO DAYS,' running from May 15 to June 2, 2026. Characters like Shin Asakura, Lu Xiaotang, and Nagumo will appear in limited-time gachas, while Taro Sakamoto can be obtained via a starter pack. The event features special quests and an X (formerly Twitter) campaign offering prizes including 'Eraberu Pay' worth up to 10,000 yen and autographed boards from six voice actors.