Honkai Impact: Picked up and Taken Home by Alicia at the Beginning

Single female protagonist "Stories often start with a gentle beginning, so the end of the story should also be gentle, right♪" "Yes, since there is a gentle beginning, the ending should also be gentle." The young man responded to the girl's question. "Just like when I brought you home, okay?" "Definitely, believe me." "I believe in you, I always believe in you, because you are my brother♪"