I think Nigel turnd Yandere because Spoiler he confessed his love to Gil during his most fragile moment- and Gil said ‘I don’t believe you’ and Nigel can’t even said anything back because the huge injury across his neck mutes him....he must have thought that everything Gil ever did for him prior was a lie....
Oh my.... *if only I dont have school....I'll be free to MTL all I want* Gil changes.... Is it Sal's influence?
No Spoiler from my understanding, that heartless part was really Gil from his past life - like back then he was an orphan along with his older bro and younger sis - he got a twisted perception of sibling love I guess - his big bro and Gil are sibling-con +Yandere
Spoiler but after that event there is like - fast forward button - Gil is 22 as far as i progresses and now we know he did all that in order to summon his sister who is now a god of that world - but she wouldn't appear to him - Gil even said he 'ruined' everything with Haref and Nigel ี
I still can believe -- I ship Haref and Gil so hard - but well, one never knows. Don't count your chickens before they're hatched ;-;;;
Why would Gil want to summon her sister into the world? Because he's a sis-con? Will he reconcile with Nigel and Haref? I'm so disappointed with Gil rn. My interest just dived into the negative zone.