Casual — to friend
Otaku · Goods
この同人誌の在庫、ある? — Do you have stock of this doujinshi? (Otaku · Goods, Casual — to friend, JLPT N4)
You
この同人誌の在庫、ある?
このどうじんしのざいこ、ある?
Do you have stock of this doujinshi?
Romaji: Kono doujinshi no zaiko, aru? / Reply Romaji: A, sore nara choudo saigo no issatsu aru yo. Torioki shite okou ka?
Reply
あ、それならちょうど最後の一冊あるよ。取り置きしとこうか?
あ、それならちょうどさいごのいっさつあるよ。とりおきしとこうか?
Oh, in that case, we have exactly one copy left. Should I put it aside for you?
Gesture & etiquette
Pointing to the display table or checking under the table while smiling.
Avoid using polite/formal language (desu/masu). Do not sound like a store clerk, but rather like a friend at a convention.