Thank you for following us for so long!
For the "looking for a crest" mission, you need to send out Lenga along with other characters to succeed that mission if I recall correctly.
I think the way it currently works is that Lenga is the only one with the mission symbol. The reward is a requirement for his prismid. We can't do the mission without Lenga and we can't get Lenga without the mission. I did reach affinity 5 with him
