Bug with Thumb Wrestling Champion event, already triggered it at the guild, but the journal says I still need to complete it to trigger the event with seraphina. 17/18 events
Viewing post in KonoSuba The Harem Adventures [v2.1] comments
You need to complete the thumb wrestling event multiple times. You will see the thumb wrestling event going-on, on every Sundays and Wednesdays in the morning. Though, there's no need to do that, coz the 18th event is still not implemented completely. You will find more contents with Seraphina and others in the next version, v2.1.
Stay tuned :D