What Should I Do After Waking Up to See My Long-Dead Grandpa?

Funny version: Tsunayoshi was absolutely sure he'd locked the doors and windows before falling asleep, and that he hadn't suddenly developed a habit of sleepwalking. Tsunayoshi: Even if I were sleepwalking, I couldn't suddenly end up in a different era with someone beside me, could I?! So, as mentioned above, when Tsunayoshi woke up, he suspected he'd seen a ghost first thing in the morning. (The First: ???) That is, until he saw Reborn. Tsunayoshi: Reborn! I knew it was you again! Reborn: Innocently raises a giant hammer. Giotto: An awkward, yet polite smile...

Serious version: After helping his teacher solve the curse, Tsunayoshi's biggest daily concerns were avoiding a budget deficit and figuring out how to become a worthy leader. But unexpected things always happen. As the new First Vongola, and the newly appointed Tenth Vongola Boss, he was transported in his sleep by the teacher he admired to the early days of the Vongola family's founding. At the same time, in the nineteenth century, a blond leader of a self-defense force received a bond from the distant future...

First published on another platform. The title was later changed to Today's Tsunayoshi Is Also Questioning His Life. The original title was What Do I Do After Waking Up to Find My Long-Dead Grandpa? Help, It's Urgent!!! The author's name remains unchanged.