Informing the school that you will be picking up your child, with a general reason
If you will be picking up your child, and your child will not take the bus home, you may inform the school of this with a general reason. It is not always necessary to give details, and you may simply say that you have something to attend to, or that you will be picking up your child for personal reasons.
Model
Conversational flow and useful expressions
Greeting
When
Why
Regarding pick-up
Closing
Parent's name
Supplement
If you write, [ 帰りは迎えに行きます。 ] (Kaeri wa mukae ni ikimasu), this means that you will be picking your child up from school, and the school will understand that your child will not be riding the bus. If you wish to be even more clear, you may write, [ 帰りは迎えに行きます。バスには乗りません。 ] (Kaeri wa mukae ni ikimasu. Basu ni wa norimasen), or "I will be picking my child up from school. He/She will not be on the bus."