The 23rd single of the 10th anniversary year of her debut! A reunion of ClariS and "Puella Magi Madoka Magica" series. This is the intro theme song for "Magia Record Puella Magi Madoka Magica", The new song "Careless" was written and composed by Sho Watanabe and arranged by Atsushi Yuasa, just like the previous theme songs. The coupling includes a mysterious song with a sound reminiscent of the late 80's, and a ballad with a gentle, clear voice that slowly seeps into your heart. Limited Pressing DVD includes the creditless intro movie of the TV anime "Magia Records Puella Magi Madoka Magica Gaiden" and comes in a Digi-pak with new illustrations of the TV anime. Limited pressing only manufactured until December 31, 2021.