Clusters are aggregates of microscopic objects or particles, formed when they attract each other. While they appear in various forms at various scales, there is growing evidence that some types of clusters governed by quantum mechanics exhibit the same universal features. Prime examples are the Efimov trimers observed in cold atoms, few-nucleons systems following the Phillips line, and neutron-rich "halo" nuclei. There are also ongoing attempts to find exotic hadronic molecules or neutronic molecules by using leading accelerator facilities around the world. How are these few-body clusters different from each other? Can we find the same universal features despite the extreme difference in energy scale between them? This workshop aims to be a platform for researchers working on these clusters in various fields of physics to reach a universal understanding across the different scales of these fields. The workshop will be held at Tohoku Universisty (Aobayama-campus) in Sendai. It will consist of two kinds of sessions. The first one will be dedicated to presentations by participants, to share recent results in different fields. The second one will provide free time to the participants to stimulate discussion and collaboration, aiming to lead to future new directions of interdisciplinary research.