The characters that are hearts in this are Kodomoppoi Amai and Tantei Shinjitsu. They consider themselves as lovers, and they are from this: https://docs.google.com/document/d/17PKt0H6_57V4bQefsskafNIlgMZyBIth4vdPqhDlrFQ/edit I wrote the thing they're from, by the way! Feel free to use any of my characters in anything with my permission!