Source of inspiration
'Hinadan' -- 'the doll staircase' -- was inspired by the Hina Matsuri, a doll festival which takes place every March, where ornamental dolls representing the emperor, his family and their guests are displayed in a specific arrangement.
In Wakamiya's app, users have to put them in the correct positions -- a task which is harder than it sounds, requiring memorisation of the complex arrangements.
The app, which is currently only available in Japanese, has been downloaded 42,000 times with hundreds of positive comments from users.
And while these figures are relatively small compared to Japan's big-hitting apps which are downloaded in their millions, 'Hinadan' has proved popular enough that Wakamiya plans to release English, Chinese and possibly French versions of the app before next year's festival.
Its success has propelled her on to the tech world stage, despite the industry's reputation for being notoriously ageist
In Silicon Valley, workers in their 40s are considered old by some firms and according to media reports citing research firm Payscale, the median age for an employee at Facebook is 29 and at Apple is 31.
But international tech firms and start-ups are slowly waking up to the economic potential of providing for silver surfers, and Wakamiya has already met with Apple's chief executive Tim Cook.
Wakamiya recalls: "He asked me what I had done to make sure that older people could use the app. I explained that I'd thought about this in my programming -- recognising that older people lose their hearing and eyesight, and their fingers might not work so well."
"Mr Cook complimented me," she says proudly, adding that he had hailed her as a "source of inspiration".