Arpeggio of Blue Steel: Enemy Unknown #4
| Series | Arpeggio of Blue Steel |
| Number | Vol. 1 #4 |
| Publisher | Seven Seas Entertainment, LLC |
| Date | 2015-04 |
| Type | Manga, Trade Paperback |
| Language | English |
| Artist | Ark Performance |
| Translator | Greg Moore |
| Writer | Ark Performance |
| Distributed By | Macmillan |
| Original Publisher | Shonengahosha Co., Ltd., Tokyo |
| Genre | Science Fiction |
| ISBN | 978-1-626921-25-2 |
| UPC | 9 781626 921252 |
| Notes | Rated: TEEN Printed in Canada. |
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