This is how I did it. I asked around the village how can I get to Chairite and I was told that it is too far away to walk (about 40 km to get there and come back).
So, as an alternative you have horse-back riding (I never did it, so I decided not to experiment with this) or a ride on a Russian Jeep. I picked the jeep. Some people go there with their motorbikes.
To hire the jeep costs 48 leva (about EUR 24) regardless the number of the passengers. Better find a group and join them, so it would be cheaper for you. I joined a group and when we shared the fee it was about 6 leva per person (EUR 3). The maximum number to travel comfortably in the jeep is 7 persons without the driver.
It is not an officially registered company but a local person, so there is no fixed schedule. He picks you up at a time comfortable for you. Drives to Chairite and shows you around and gets you back to Trigrad.
A bus leaves from the bus terminal in the town of Devin each evening at 17:30. It leaves by the southeast road and travels south, stopping at the villages of Nastan, Grohotno and Gyovren before arriving in Trigrad at about 18:50. The bus then continues its way south, stopping at Zhrebevo before arriving at its destination, Kesten. The fare for the journey between Devin and Trigrad is 4 lv. Buy a ticket on the bus, by paying the driver. The driver will, however, give you a ticket worth much less -- maybe 1 lv -- so as to reduce the amount he has to declare to his employer, and he will pocket the rest.
The bus makes its return journey from Kesten in the morning. It stops at Trigrad at 07:00 and arrives in Devin around 08:20.
Villagers who don't have a car but need to travel along this route at any other time of day will hitchhike. Wait at an appropriate junction, or walk along the route, and wave down anyone going your way. If they have space in their vehicle, they will stop for you. You do not need to pay them if they give you a lift.
okay, TRABANT is not the best transportation you can find here... There are better ways to travel :-)