A character asked her what she was doing "here", and she answered :


I don't understand the part with にする, what does that mean ?


「[1人]{ひとり}にする」 here means "to leave someone alone".

It should be remembered as a set phrase, but if you need to understand it grammatically, 「~~する」 here means "to make/let/leave one ~~".


thus means:

"We all agreed to do our best not to leave a person alone during the investigation, didn't we?"

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