Past decision still in effect with 〜ことになっている
Grammar: Time and Sequence
ことになっている says that a rule, schedule, or decision established earlier still applies. It follows a plain affirmative or negative verb.
Further Reading
- ことになる Japanese Grammar Lesson (wildnihongo.com)
Examples
Arranged to assist in a lab with 〜ことになっている

Reika sees an unknown person in the old lab next to her class’s. She asks to woman if she’s an assistant.
- せつな:
- 「いえ 学生です理学部
( の」- “No, I'm a student, in the science department.”
- 「こちらの研究室
( のお手伝( いをさせて頂( くことになって」- “It's arranged for me to help out in this lab.”
- “No, I'm a student, in the science department.”
Hired to work for the summer with 〜ことになっている

Rinko (Yamato) interviews for a summer job at her favorite cake shop. Following the interview, she is hired and is set to start work the next day. She’s excited at the various new techniques she’ll learn that she’ll use to make various sweets for her boyfriend, Takeo.
- 凛子
( : - 「それがいちばん楽
( しみかも」- “I think that's what I'm most looking forward to.”
- 猛男
( : - 「大和
( うれしそうだな」- “Yamato looks happy.”
- 「ずっと好
( きだったケーキ屋( で働( けることになってよかった」- “I'm glad it's arranged that she'll be able to work at her most favorite cake shop.”
- “Yamato looks happy.”
Scheduled to stay the night with 〜ことになっている

After a day playing at the beach, Hikari asks Shindou when someone is coming to pick everyone up. Shindou says it will be “tomorrow evening”.
- 神藤
( : - 「今日
( はウチの別荘( に泊( まることになっているって言( っただろう?」- “Didn't I say we're scheduled to stay the night at my villa?”
Supplemental Examples
Try finding this grammar in the following examples: