Wandering Traveleris the fifth stage in Western Street.
A Le'boin will enter the field periodically, and multiple Le'boins can exist onscreen at once.
This is the stage where you can feel the true terror of Le'boin. Try to kill him as quickly as possible. Prevent the Le'boins from stacking on one another, as it reduces the amount of time you have to counter-attack. If three Le'boins stack up, it is recommended to restart, as it is nearly impossible.
If you are going for 3 stars difficulty, note that each Le'boin has about 120,000 health and each one does more than 20,000 damage per shot. It is recommended to save up for a Bahamut Cat or loot the level by using uber rares with long range.
On 4 stars, the Le'boins have almost 200,000 and deal enough damage to one shot basically every Rare or Special cat you might have (over 30,000) so bring spammable Rare units. Use Bahamut Cat and Special cats from later Stories of Legends levels that have greater range than Le'Boin (Ururun Wolf, Li'l Nyandam) and protect them with cats that survive lethal strikes (Jiangshi Cat and/or Madam Savanah). Stall the Le'Boins as much as possible and allow your damage dealers to get as many hits as you can.