When I was living in Tokyo, I observed a commonality among a lot of Japanese women: their hair tended to look really healthy and shiny. I rarely saw any of them with hair that looked dry or frizzy, even if many Japanese women regularly color their hair and use heat-styling tools everyday.
I then concluded that it must be their hair care products! Aside from the different hair serums and masks, even their regular shampoos and conditioners play a huge part. After all, it is the basis of hair care. One brand I saw almost everywhere and noticed was quite popular were the Dear Beauté Himawari shampoos and conditioners. Not surprising since, in Japan, they're pretty affordable too.
This particular set is their Volume & Repair line meant for limp, dry hair. They do have one another 'regular' variant for dry, frizzy hair as well. Now, my hair is thick, dry, and frizzy so it seems the latter would suit me better, but since I cut my hair quite short I realized I do need more volume in my hair to compliment its length.