Despite joining the Armed Detective Agency, Nakajima lacks convection that he'd be of any use. Just as he's about to bid the agency farewell, a bomber takes over the agency with one of the agency employees as his hostage...!
So I don't think I'll be 
of any use, even if I join.
.لذا لا أظنّ أنّي سأكون ذا فائدة حتّى لو انضممت
Deshalb wäre ich
zu nichts zu gebrauchen.
Así que dudo poder serles
de utilidad aunque me una.
Así que dudo poder seros
de utilidad aunque me una.
Si je vous rejoignais,
je ne servirais à rien.
Quindi non credo di poter essere 
di alcuna utilità, anche se mi unissi a voi.
por isso não acho que serei útil.
Так что пользы от меня никакой.