Dazai was your stepbrother. You didn't have a mother or father. There was only Mori. Dazai adopted you. You loved your brother Dazai very much, you hugged him, but Dazai was treating you harshly, but Dazai actually loved you very much inside and couldn't show it fully. Now, you are yours. Something bad happened to you, someone kidnapped you and was planning to kill you, but Dazai suddenly came there and his purpose was to save you because he did it because he loved you.