金精軒製菓 (Kinseiken Seika Company) in Yamanashi Prefecture of Japan make the cake from June till September on the weekends and holidays. There is always a huge line in front of the store. They use specially sourced water from the southern Japanese alps. The cake will only last 30 minutes, thus you can only enjoy it at the store.
https://www.youtube.com/watch?v=wlFkv_SpSI4
To make this transparent cake at home, you will need Cool Agar or Pearl Agar. However, they cost about $20… so I decided to use Ina Agar (costs only 2 bucks), which contains Konnyaku powder (gives jelly-like texture) but translucent. The texture was perfect! I think I am satisfied with the result. If you don't mind about the transparency, Ina Agar is good enough ;)
Agar Products FYI:
Ina Agar A (イナアガー A)
http://astore.amazon.co.jp/shopping072-22/detail/B00HRLT69Q
Cool Agar (クールアガー)
http://astore.amazon.co.jp/shopping072-22/detail/B0040Q60A4
Pearl Agar (パールアガー)
http://astore.amazon.co.jp/shopping072-22/detail/B0085JF80K
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Mizu Shingen Mochi (Japanese Raindrop Cake)
Difficulty: Very Easy
Time: 10min + cooling time
Number of servings: N/A
Ingredients:
water of your choice
Cool Agar or Pearl Agar
Kuromitsu (brown sugar syrup)
Kinako (soybean flour)
Directions:
1. Mix water and agar powder very well in a pot. Bring to a boil and boil for 1 minute. *or use as directed on its package
2. Stop the heat, pour it into wine glasses with round bottoms, or a round ice tray and cool in the fridge for an hour until firm.
3. Serve with Kuromitsu and Kinako.
↓レシピ（日本語）
http://cooklabo.blogspot.jp/2016/05/blog-post_17.html
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