Responses
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That text comes from his adoptive mother i think. In that message she asked how he was doing now, how the new school was and did he get used to it. She also said they (?) often talked about him lately, that they missed him and hoped that he would come home sometime. Hope this help you and sr if my english is confusing ( ̄∇ ̄")
Does anyone know what that text Mitsu gets at the end of chapter 9 says? Here is the link to the one I mean: http://www.mangago.zone/read-manga/kizudarake_no_hakoniwa/uu/tr_chapter-9/pg-22/
I feel like the dream he has about things remaining broken had something to do with it. I looked around to see if there was any sort of explanation, but couldn't find anything in the comments or the manga itself :(