The First Generation: Click to Help My Sister Rejoin Society

Yan Zhen and his younger sister accidentally discovered a treasure map left by their ancestors: a fragmentary map of Namimori. The name Sawada Muen was written beside it.

To save the Simon family, which had begun to decline, Yan Zhen headed to Namimori with his sister and the Guardians, swearing to find the treasure and restore the family's glory.

While heading to the treasure site with his friend Tsunayoshi, they were surprised to discover it was the old house where the first-generation Vongola had once lived. After finding a book of advice on raising daughters and a diary full of blood, sweat, and tears, they finally learned of the connection between the Simon and Vongola families a hundred years ago.

Yan Zhen: So Tsuna and I are actually related? (Eyes shaking with shock)

Tsunayoshi: Wait, no. Why was the First's younger sister spending her retirement with the Simon family?!

As always, this is a no-pairing, family-focused story. The two plotlines run in parallel, following Yan Zhen and his sister, and the First and his sister.

It's rare to see two characters who genuinely adore their little sisters!

(As the title suggests, the First's younger sister is a force to be reckoned with.)

This is independent of the Katekyo series' four-part storyline and isn't connected to -1 or 45. I don't know when I'll start posting; it depends on when I finish working out the outline (looking away).

Theme: Family comes first.