約束 -Promise code-

"約束 -Promise code-" is a song by GARNiDELiA that appeared in 2016 as the second ending theme for the television anime Qualidea Code (クオリディア・コード), produced by A-1 Pictures. Sony Music released it as a single on August 17, 2016, the same year the series aired.

Built as polished J-Pop, the track moves at a measured pace and gradually opens from controlled verses into a wider, more emphatic chorus. MARiA's vocal delivery stays precise and slightly tense, while the arrangement gives the melody a sleek electronic shine rather than a heavy rock edge.

The single came out in several editions, including a regular release and a limited version with a DVD. MusicBrainz credits toku as composer and MARiA as lyricist. Within Qualidea Code, the song's mix of restraint and lift suits a story about young commanders carrying the pressure of an ongoing war against the Unknown.