Old trail is faster route up to Kurogane hut.
[Basha michi] takes more time because of zigzag route there.
You can take either. Both trails are finally merged.

For Kurogane hut.
From here, nothing blocks your sight and take fun walk.

You can see Mt. Adatara in the distance.
Don't you think Mt. Adatara looks like a nipple?

Reach to Seshidaira.
The route on your left is shortcut directly to the summit.