This is a special album produced to conclude the 10th anniversary of Sennzai's musical activities, which began at the end of last year. Carefully selected from more than 100 guest songs in a wide range of singing genres that Sennzai has sung up to now, the album features songs by a gorgeous production team. A total of 13 songs are included, including "Strahv" from the music game "CHUNITHM" and "Seclusion" from "Arcaea," which is being recorded for the first time on CD. Whether you're a newcomer to Sennzai or a long-time fan, you'll be able to enjoy this fully-preserved album that covers the trajectory of her activities.