Ginza Akebono is a must-visit wagashi (Japanese sweets) shop in Tokyo. They have many branches around Tokyo and there is sometimes a line-up. But after trying it, you will understand why. They have seasonal sweets too, such as sakura. One piece is around ¥273.
Toraya is a high-end wagashi store and their store is aesthetically great! They have seasonal sweets and desserts and is definitely worth stopping at for a break. The mochi also makes for a great souvenir for someone you love. This store was founded in 1526, so I guess it's safe to say it's been around for a while! They have shops all around Japan, and 6 in Tokyo. Have you tried the azuki and chocolate fondant?
Takemura is in its original 1930 building, which is considered to be a Historical building. Tucked away in a small and interesting neighbourhood near Ochanomizu, this shop is a little hard to find. But, it's worth the trouble. You should try their sakura water and their deep friend Manju.
Oosumi Tamaya is famous for creating the original "ichigo daifuku" (strawberry covered mochi) and the original store is in Shinjuku.
Ichigo daifuku is a delicious dessert because it is soft and has an interesting texture, and the taste has the right balance of sweetness. It is a Japanese classic that you need to try! A piece is ¥230.
Nagato is a 300 year old Japanese sweets confectioner located in Nihombashi. They have loads of seasonal sweets to try from, such as yuzu. It is definitely worth trying. Mochi is ¥350 each.
Shimura is a highly-regarded wagashiya near Mejiro Station that is famous for its fantastic, visually impressive shaved ice dishes (kakigori). You should definitely give one of these a try if you go here as well, but the outstanding mochi item that you must eat is the 'Tsukumo Mochi' (九十九餅). The very special mochi is filled with red beans and covered in kinako (toasted soybean powder). They've been making these 'Tsukumo Mochi' since the early Showa period and the fantastic taste and texture is apparently unchanged and as enchanting as ever.
Chimoto is an outstanding wagashiya located a bit away from central Tokyo near Toritsu Daigaku Station in Meguro-ku. There are 2 special types mochi here that I want you to try. One is the 'Yakumo Mochi' shown above, which is a light and delicate brown sugar and cashew mochi that is sold wrapped in a bamboo leaf. It's unlike any other mochi you've tried before!
The other special moichi to try (while available in springtime) is the 'Sakura Mochi' shown below. It's a simple and beautiful mochi that offers a variety of textures and flavors in each bite.