noun
volume 1; first volume
Refers to the first volume of a multi-volume work such as a book, manga, or series.
この漫画の第一巻はもう読みましたか。
Have you already read volume 1 of this manga?
第一巻は来月発売予定です。
Volume 1 is scheduled to go on sale next month.
Also means 'first volume', but is less common and more formal than 第一巻.
Compound of 第一 (first) and 巻 (volume). The reading だいいっかん results from the combination of だいいち and かん, with a sound change from ち to っ.