Iemitsu is not the only one with a notable bloodline. Nana's lineage claimed Tsuna long before Reborn came to train him for the Vongola. When Reborn goes to Namimori to train the Decimo, he only finds an empty house.

They only wanted a quiet school year. They got the Vongola instead. Arisa Kosao and Kasari Tanaka transfer to Namimori Middle hoping for a fresh start - new friends, new classes, and maybe fewer explosions than their last school. Then they meet Tsuna Sawada and his "home tutor." Now they're dodging dynamite in math class, baking cakes that detonate, and somehow getting recruited for "training missions" led by a baby with a fedora. Everyone swears it's normal. It's not. Friendship, fire, and the chaos of finding your place... all before they even learn what Vongola truly means.