ことになる [1]

It has been decided that..; it turns out that.. kototonaru (more formal/strict)

Explanation of ことになる [1]

じゃあ、あなたたちがおかあさんのドラゴンを...!
すまない。まさか...、くんのおかあさんをころしてしまうことになるとは...。

Then, you guys killed my mother’s dragon...! 
I’m sorry, there’s no way I’d thought... for it to turn out to kill your mother...

More Examples

(Word Search. May not be used the same way as described above.)

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