Expelled SSS-Rank Architect, Rebuilding the Demon Kings Castle!

Johann Grecia belonged to the hero party as an adventurer with the SSS-rank skill [Architect]. He contributed to the suppression of the demon king in his own unique ways. Such as building a guild in the vicinity of the Demon King’s castle, or building a trap house to destroy many demons. However, on the very day the heroes brought down the Demon King, he was branded as useless, and pressured by the party to leave. Furthermore, all his qualifications as an adventurer have been revoked, and all the constructions he produced with his skill had been taken. Johann who lost everything, does not care about building with his skill anymore, and is currently camping all alone. Around that time, he e...