Totsugami - Vol. 4 Ch. 22

[MangaDex]

 

[Kaarme]

If you think about, the grandma was super irresponsible for leaving the mound just like that without a caretaker, barrier broken, with Tasuke's memories sealed and training unfinished. As if that wasn't enough, there's a warehouse seemingly full of sealed monsters, with the seals so weak that sneezing in the wrong direction with make them collapse. If the grandmother was like that, it's no wonder the grandson is so hopeless.