〜ことになる
JLPT N4 Nominalizers and decisionsit has been decided that
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ことになる reports an arrangement or decision made by others or by circumstances, not by the speaker's own will. It is also used to soften decisions you did in fact make. The state ことになっている describes standing rules and customs.
Examples
からににました。 Shigatsu kara Toukyou ni sumu koto ni narimashita.
It has been decided that I will live in Tokyo from April.
へにました。 Raishuu Oosaka e shucchou suru koto ni narimashita.
It has been arranged that I will go on a business trip to Osaka next week.