A Group Transmigrates into the Rainbow Children, and Their Superpowered Basketball Team Is a Boy Band. Is Something Wrong?

I love playing basketball, and at my sister's urging, I cosplayed with my teammates as the once-popular idols, the Generation of Miracles from Kuroko's Basketball. Then we all transmigrated... And I became Kise Ryota, the Yokohama idol whose ability is called Small Forward. Something seems a little off here?! *, * As everyone knows, the rainbow has seven colors, but we only have six: red, yellow, green, cyan, blue, and purple. It's time to invite a new victim, I mean, trainee, to join our boy band. "So, Chuuya, become an idol! The Rainbow Seven are just one short of you." *, * Extra A: Have you heard the latest news about the Rainbow Children? Extra B: What, you know about the Rainbow Children too?! Reborn had only just arrived in Japan when he was astonished to discover that everyone already knew his identity. Then the world's number one hitman saw six, no, seven men on the scene who loved singing, dancing, rapping, and playing basketball... Theme: Just laugh and enjoy it