The shiguku ark begins how it left off and the end of the battle of Hell Ark it begins with sato and senjiro about to fight 100 demons with fire and ice jujutsu

The shiguku ark begins

To be continued in the shiguku ark

Book 3 ends with sato and senjiro with flame and ice jujutsu about to fight 100 demons and it ends with to be continued in the shiguku arc

Senjiro about to burn 100 demons and sato about to freeze 100 demons the end of book 3, and it says to be continued in the shiguku arc

The shiguku ark begins how it left off and the end of the battle of Hell Ark it begins with sato and senjiro about to fight 100 demons with fire and ice jujutsu

Then

The flash

in the park

The vampire devil

A man playing the piano

Then it is the end of chapter 4 the weakest demon queen is officially dead and gone

They arrive at the village. Villagers greet them with welcoming smiles. Hiro smiles warmly.