Oh OK I got it now. I think I didn't read this woman's guide that she allows me to go through the backdoor, as I didn't remember that this house was blocked by a "policeman" before. Sorry for the trouble and thanks a lot!.I have talked to the head priest at Gankutsu Temple. He said this and that's it.
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Regarding Souta, I have also went back to every town to talk to him, including the very first house MC left from, but still no progression. The talk with him at Gensai's house shows only this:
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And if I talked to him at the Souryu town's inn, he only says this:
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