A Childhood Friend Dropped from the Sky

Chi Ranqiu woke up one day to find she had acquired something calling itself a "Heaven-Sent Childhood Friend" System. "A heaven-sent childhood friend is someone even more amazing than a heaven-sent arrival or a childhood friend!" the System explained. Chi Ranqiu: So a heaven-sent childhood friend is a childhood friend who suddenly comes back after years away? System: Bingo! That's exactly what it means. System: Your mission is to help the System's dimension collect information. The more emotional reactions you inspire, the better! And so, one day, everyone discovered that their childhood friend, whom they hadn't seen in ages, had returned. The Strongest Sorcerer: Xiao Qiu is back in the country? The Bandage-Wearing Weirdo: Xiao Qiu~ I've missed you so much~ The Little Sun of Karasuno Volleyball: Qiu!!! P.S. A quick-transmigration crossover featuring all sorts of series, including but not limited to Jujutsu Kaisen, Bungou Stray Dogs, Haikyuu!!, The Disastrous Life of Saiki K., Gintama, Free!, K, Mob Psycho 100, and Fate/Zero. Theme: Moving forward together