[rath111]

1. Have a bonded youkai with Contract Uno at the top of your youkai list. Somewhere below in the list also have a non-bonded youkai.
2. Check your stats and confirm your current Crit Evade and Hit Chance values.
3. Swap the positions of the bonded youkai and non-bonded youkai in your youkai list.
4. Check your stats and confirm your Crit Evade and Hit Chance are 10 points higher with this non-bonded youkai.

Happens 100% of the time per steps above.

Wanted to note that if this non-bonded youkai becomes bonded in the future then it'll no longer give this +10 bonus.