I was so curious about shitting girl, i tried google transated myself. And here is my explain ( but sorry for bad grammar)
Goddness statue scene - statue has special power, people who saw statue are must pray. ( some kind of hypnosis ) - and do most embrassing action who prayer think ( in her case , peeing and shitting )
Bloomer scene - I didn't notice this scene but flow is ( she loose her pants so she found that bloomer somehow and equip ) - as you can see, that was cursed? bloomer
Walking shitting scene - after unequiped bloomer, she tried to move and suddenly her belly growling and feel good - she shit little and cumming. soon she do massively shitting and feel big cumming - after shitting, she feel weird in her belly so she try to escape quickly - soon she came by squrting intestinal juice(?) and passed out - acording to last pic of this scene(gray pic) Bloomer monster's liquid can make person's guts to Erogenous zone so she can came by shitting
After Escape scene ( p170 ) - she came back to village and trying to cure? with her partner (maybe boyfriend? his name is Ru(Roo)) - she wearing prototype diaper? pants? filled with melting slime. ( it means if she shitting than slime melting her shit immediately ) - she cumming by shitting and slime melting her shit. but slime couldn't melt her intestinal juice and died. - Roo said first test is failed but he likes her face when shitting - Last description said She and Roo found out her juice is some kind of powerful holy water. and selling to people