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Probably either research chemicals or jailbreaking tech.
As for the former I fell down a rabbit hole reading about research chemicals on some subreddit and hearing people's reports.
Jailbreaking doesn't feel as illegal, I'm not in Japan, but it makes me feel like a badass early 2000s hacker helping my friends with their 3DSs and PS3s and seeing their reactions.
Is "research chemicals" a euphemism or are you literally referring to chemical substances/precursors purchased and used by laboratories that are also available to the public?
"Research chemicals" is a term used for new psychoactive substances that haven't been covered under any laws yet. They were called "designer drugs" decade ago, but that was bad PR.
Chemicals substances and precursors are just called chemical substances or chemicals. You can order almost anything off of a laboratory store online and they'll ship most of it to you through the mail.