Small guide for secrets location and other stuff
Note: if there is nothing about a mission (for exemple mission 2), it means there is nothing to collect in the mission
1/3
At the top of the tower (blocked for me, it will be unlocked with the story)

First rune
Near the lake at the spawn

Second Rune
At the house when you first get it, you won’t miss it.
Jump on the rock that is just i nfront, you’ll see the secret
Second Location
Just behind the small shrine


Third Location
Just under the elevator platform, on a ledge

Near the target
Near the destroyed house
Oroshi sword
First collectible
Under the big house at the end of the map


|Second collectible
Inside the tower at the beginning


In an house at the edge of the river

Second collectible
On a cliff near the small island with the sakura tree


Third collectible
At the top of the small tower at the big house

Right after the garden of the left house

At the house on top of the cliff, on a ledge

Rune
In the hole at the bottom of the mine


If you don’t have it, check mission 3 before.
Collectible
At a ruined tower near the entrance of the garden looking thing at the left of the castle


Rune
Under the bridge between the castle and the garden

The house at the spawn near the cliff

Armor color
In an house near the cliff.



Thanks to Lunhaadviin for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.