Board Thread:Questions and Answers/@comment-101.98.230.188-20200126064529/@comment-44719384-20200126174512

Do you remember what vocaloid was used? Was it a masculine or feminine vocal? Was it a duet or was there only one singer? What does the girl leaning outside the window look like?

As for "girl outside a window," 想像フォレスト (Souzou Forest) comes to mind, but I don't suppose that's what you're thinking of.