With over 300 million views on "Shousetsuka ni Narou" (as of August 2025) and more than 2.5 million copies in print, the hit series "The Carefree Lord's Fun Territory Defense: Building the Strongest Fortress City with Production Magic" is coming to TV! The opening theme for the January 2026 anime is "Okirakuze~shon" by Rei Nakajima, written and composed by Kenichi Maeyamada (Hyadain). A lively, cute, and pop tune overflowing with cheerful energy, featuring fun shouts like "Nonbiri!" and "Yoisho!" The coupling track "Moshimo-shi," written by Rei herself, is the theme song for her CBC Radio show "Rei Nakajima no Kyou mo Hanamaru! Radio," whose production process was shared on-air.