While you might be already familiar with it, "frustration" refers to a situation where interactions compete with each other, typically preventing conventional thermodynamic orderings. As a theorist, this is a fascinating opportunity to seek for novel states of matter, and some of them could be also useful for technological applications (e.g., skyrmion crystals for spintronics). The main challenge to us is that currently we are not aware of a generic method for a frustrated quantum system by which one can study any problem he/she wants to solve in d > 1 dimensions; brute force does not work beyond a certain point. Thus, it is extremely nice if we could develop a new theoretical approach. One thing that I’m planning to do in RIKEN is in such a direction, where my target is the tensor-network method (originally proposed from quantum information community); the other thing I’m interested in now is the kernel polynomial method, which should be useful for a classical model coupled to itinerant electrons. I will also continue collaborations with experimentalists, which often gives us an insight about a new research direction.