This video tutorial will show you how to find all 30 Ainu Items in Ghost of Yotei. If you get close to one, you should see fireflies.
You can find the video guide, along with with time stamps, below:
0:00 A Drink with a Stranger Ainu Item
4:28 Southern Coast Ainu Item
5:35 Lake Kuttara Ainu Item
7:05 Windy Meadow Ainu Item
8:35 Jade Grove Ainu Item
9:49 Nupur River (Yotei Grasslands) #1 Ainu Item
11:04 Nupur River (Yotei Grasslands) #2 Ainu Item
12:32 Otaru Hills Ainu Item
13:44 Howling Cove Ainu Item
14:51 Nakagoya Spring Ainu Item
16:18 Rumoi River Ainu Item
18:10 Serpent Pass Ainu Item
18:54 Ishiusu Basin Ainu Item
20:22 Yamane Bluffs Ainu Item
22:47 Shizunai Woods Ainu Item
24:25 Boar’s Eye Cave Ainu Item
25:49 Marshland Homestead Ainu Item
26:39 The Soul of an Instrument Ainu Item
33:08 Nayoro Falls Ainu Item
34:12 Nupur River (Nayoro Wilds) Ainu Item
35:30 Niptay Mountain Ainu Item
42:31 Teshio Coast Ainu Item
43:44 Sakuru Woods Ainu Item
45:04 Sarobetsu Lake Ainu Item
46:04 Hunting Camp Hideout Ainu Item
48:02 Cape Inari Hideout Ainu Item
55:05 Miyama Village Ainu Item
55:53 Hakodate Shore Ainu Item
56:50 Orito Forest Ainu Item
57:43 Saito Artillery Outpost Ainu Item
58:49 All Ainu Rewards