Bond Level Up: When a character bond exp reach the limit and the MC talk to them during Lone Wolf Mode a certain event will occur as well as bond level risen along with new cap, if nothing happen despite meeting condition above then... it's just the location are not right (try again at other city).
Note: At some level (probably 3~4 and 4~5), a certain key item might be needed for a certain character event to occur.
Lone Wolf Mode: Go to INN and talk to INN keep, she will say "Would you like to stay?" answer "Yes" and then when the INN keep ask again "Do you want to rest now?" answer "No" doing this will result party members exclude the MC will leave the party and go to anywhere they like around the town.
Side Note:
*MC can't leave the town during Lone Wolf Mode, go back to INN and say "Yes" to rest, aftet that everyone will rejoin the party.
*There are multiple way to boost Bond Exp, such as Affection state gained after rest at INN however it's random.