1. Easy to make "Otsumami" and drinking snacks すぐ作れる酒の肴とおつまみ (In Japanese).
cream cheese tuna tartar, browned crispy rice with Parmesan cheese, crispy fried chicken wing with sesame are among those.
A bit of digression; "Sake no sakana" 酒の肴 means anything (mostly food) which goes well with drinking and enhances the enjoyment of drinking. "Sakana" when written as "魚" means "fish" but the original meaning of "sakana" is "food" with a corresponding ideogram of 肴. "Otsumami" おつまみ is similar but, perhaps, simpler and smaller dishes, which are perfect for "Otoshi" お通し or the starter snack. "Tsumamu" つまむ literally means to "pick up" or "pinch" (by fingers or chopsticks). "Ate" あて such as in "sake no ate" is another word meaning the same. "Ate" is a short for "Ategau" あてがう "to accompany or to place next to". Any food which makes a good accompaniment for sake is therefore "ate".
2. "Otoshi" and "Kobachi" idea dishes of Izakaya by Tadashi Shinojima (In Japanese) 居酒屋のお通し、小鉢、アイデア料理 志の島忠 (In Japanese)
simmered deep-fried tofu and daikon roll, Kanpyo and checkered daikon and carrot. I really like this book and even though you may not follow his recipes, you could get some ideas of how you can make small drinking dishes by just looking through this well illustrated book.
The second book (image below on the left) is titled "A la carte dishes of Izakaya" 居酒屋の一品料理. It is the continuation of his first book but it is organized mostly by the ingredients; for example, dishes of fish, which are then organized by different kinds of fish and so on. There is one section organized by four seasons, since it is important to reflect each seasons in Japanese cuisine, even Izakaya dishes. One word to describe this idea is "shun" 旬. Although they are very nice looking dishes, many ingredients, especially fresh fish, are beyond my reach but it is a nice book to look through.
The third book (image below on the right) is called "Popular Japanese dishes of Izakaya: Drinking snacks with new twists" 居酒屋の人気の和風料理：新趣向の酒の肴. This one is the least useful to me. It is like a cooking textbook and goes through the techniques and how to arrange the dishes but there are not many interesting recipes per se.
3. "Otsumami" alley and "Otsumami" alley volume 2 by Yukiko Seo, おつまみ横町、おつまみ横町-もう一軒. 瀬尾幸子 (In Japanese).Dave Perry recommended two Izakaya cookbooks to me called "Otsumami Youkocho" おつまみ横町. There are two volumes. Both are called "drinking snack alley". The second is distinguished from the first by the additional phrase in the title of "Mou ikken" もう一軒 meaning "one more place". This is an appropriate name for the second volume because this phrase is a classic nagging request made by drinking enthusiasts (read; drunkards) who have finished their first rounds but don't want the bar hopping to end..."just one more place". In any case, I got these books from Amazon Japan (The shipping was more than the cost of the books). These two volumes each contain recipes for 185 small dishes which go well with drinks. Many of the dishes are rather simple (or easy to make) and some are not really new or original but the two volumes still contain a good number of dishes that I would like to try (and post) Thus far, I posted three dishes from this book, which were really easy to make and good.
4. Hugely delicious drinking snacks by Kentaro Kobayashi ドカンと, うまい つまみ 小林ケンタロウ (In Japanese)
few cook books but this appears to be his only drinking snack cookbook.
Recipes are mostly cook-as-you-drink type quick dishes, which fit my style of cooking. I have tried some from this book such as "butter, soy sauce with wasabi on steak" and "cabbage braised in butter". One section contains "teiban" izakaya dishes with some useful tips. Nothing unexpected or unusual but this book is very helpful to make quick drinking snacks from whatever ingredients you happen to have.
5. Secret drinking snacks of the head chefs 料理長がこっそり教える酒の肴 (In Japanese)
Cod roe and mountain potato gelée 鱈子と長いものジェル寄せ". This is one of our most favorite drinking snacks and is perfect with cold sake. For me, this dish alone is worth getting the book.
I think there is the second book in this series but I did not have a chance to check it out.