  In this work, we explore a systematic investigation on $S$-wave interactions
between a doubly charmed baryon $\Xi_{cc}(3621)$ and a charmed meson in a $T$
doublet $(D_1,\,D_2^*)$. We first analyze the possibility for forming
$\Xi_{cc}D_1/\Xi_{cc}D_2^*$ bound states with the heavy quark spin symmetry.
Then, we further perform a dynamical study on the $\Xi_{cc}D_1/\Xi_{cc}D_2^*$
interactions within a one-boson-exchange model by considering both the $S$-$D$
wave mixing and coupled channel effect. Finally, our numerical results conform
the proposals from the heavy quark spin symmetry analysis: the $\Xi_{cc}D_1$
systems with $I(J^P)=$ $0(1/2^+,\,3/2^+)$ and the $\Xi_{cc}D_2^*$ systems with
$I(J^P)=$ $0(3/2^+,\,5/2^+)$ can possibly be loose triple-charm molecular
pentaquarks. Meanwhile, we also extend our model to the $\Xi_{cc}\bar{D}_1$ and
$\Xi_{cc}\bar D_2^*$ systems, and our results indicate the isoscalars of
$\Xi_{cc}\bar{D}_1$ and $\Xi_{cc}\bar{D}_2^*$ can be possible molecular
candidates.
