Band That Takes Time

the audition for the continuation of the Girls band "Chahan" training contract of the affiliated office failed, and the president Yanagishita declared that the contract would be canceled if 500 CDs in stock were not sold out within 3 days. Chahhan was at a loss, but Ryo, a music producer from the self-proclaimed future, came and came up with an idea to sell out 500 copies. The band members are moved by Ryo who shows his struggle while embracing the mysterious man. Why is a man enthusiastic about "Chahhan" who is likely to be cut off from the office? Did he really come from the future?