After Reborn came to Tsuna's house as a tutor, there was never a day without joy in Tsuna's life. In addition, his cousin Rin Sawada, who had loved teasing him since he was a child, also came to join the family, making Tsuna even more exhausted both physically and mentally. On the eve of the Obsidian War, Rin had to leave temporarily to deal with "some things". When he came back, he was already acting as the Son of Rainbow after the war. I thought I could get a proper rest after the proxy war, but I didn't expect that Rin's return would set off another huge wave. How should Gang and the others face the next battle?