In fact, it is the story of the tenth generation of Vongola's strategist Qian Shan Fuzhen who traveled through the bone-eating well in "Inuyasha" to 300 years ago and met Giotto in Italy and then developed into the great-great-grandmother of Tsuna.
It will be interspersed with stories from the future of the tutoring drama. Giotto's character seems to have changed a bit, and the plot may be a bit unconventional. Generally speaking, what happened in the first generation is not clear, so it may be written in a general way.