How exactly does she die on the bad ending route? Why is he so convinced that only getting together with the game protagonist can avert that destiny? Could he not just take the protagonist's place in doing whatever it is that prevents her death?

@kmakimak exactly many things have already changed, the heroines are only getting close to you, not the game lead.

@comment yeah the lead is quite stupid it seems, at least for now, just goes with the flow and no real independent thought. I'm not the smartest person for sure but I see 2 solutions that would come to my mind. Develop relationship with Idol girl allowing easy clear for Kiriha . Or romantic relationship Kiriha with the lead, she wouldn't be heartbroken, so likely not die. Yeah the original work has already changed a lot and the world is still running.

@KURISADA Isn't it BSS, the game lead is with no one yet, he's on Kirha route, but he wants to be with her and is tempted by sister and idol. He hasn't confessed his feelings to anyone. My personal theory is the game developers set all the heroines to be in love with the game lead, however in real life they don't understand why they are in love with him and our lead exhibits more of the traits they are attracted to.

@nihir agreed can't save anything at this rate. Take some time, think things through and become active in trying to save her and keep the world going if that's what he wants.

う～ん主人公バッカじゃないの～？
まず
桐葉が死ぬ原因って恋が叶わなくて絶望するのが始まり的なこと言ってなかったかいな？
それなら
別に俊樹である必要がまずない主人公ざかわりに愛せるのなら全然大丈夫だろ！
(他の女ができても相手によっては許してくれるのかな？一番愛されるか平等なのかは知らん！)
あと
世界が崩壊するわけないやろ😅そんなことで
崩壊するならまず転生させた存在がもう崩壊
してるやろもう原作壊しまくってるんだしさ～

↓2　そうか、「プレイヤーが動かしていないからヒロインに能動的にアクションをしない俊樹」ばかり見てたけど、
「エロゲの親友枠に徹して振舞っているがその行動は現実に照らし合わせると親身になって助けてくれるイケメンになってることに気付いてない哲彦」にも非があるのか。

最近ハートの防御力が大幅低下してます
この話は旧版である程度内容を知ってるから大丈夫だけどもしそれを知らなかったらこれだけでヤバいかもです
だって不倫系や浮気系の話っていい感じに終わっても必ずモヤが残りますから

主人公は現実を受け入れてない。何時までもゲームをしている気分だから、何も救えないだろう。