Question: What is the nationality of "Yen" a Singer-songwriter band?
Sentence (from "Swallowtail Butterfly (Ai no Uta)"): "Swallowtail Butterfly (Ai no Uta)" (あいのうた , Suwarōteiru Batafurai Ai no Uta , "Love Song") is a song by Chara, released under the name "Yen Town Band".
Relevant evidence: No