Dungeon ni Deai o Motomeru no wa Machigatte Iru Darou ka Gaiden - Sword Oratoria - Ch. 128 - Memoria Freese

[MangaDex]

 

[Alx-Jeager115]

I guess this is a part that the main novel doesn't tell you, that Bell participated in it, and it's only on Ais' side.

 

[PutuKa]

I guess this is a part that the main novel doesn't tell you, that Bell participated in it, and it's only on Ais' side.

In the fandom web it is listed that bell participate in the operation (i didnt actually read the novel but it should be pretty accurate since his contribution is written pretty detailed), so i'm not sure which which novel you had read