Apr 30, 2026

My App Is Finally on Google Play — After 5 Years!

I developed a cardiac auscultation training app in Japanese and released it for free. The response has been surprisingly decent, so I decided to take the plunge — translate it into English and sell it on Google Play.
I've been updating the app regularly over the years, but dealing with the submission process was always such a hassle that I'd just been getting by with a web app. Functionally, a web app does the job just fine — it just doesn't make any money.

This is my first paid app release since 2019. It turned out to be way more work than I expected, but with a little help from AI, I managed to get through the build and submission process, and the app was ultimately approved.

As for the App Store — yes, I know iOS tends to generate more revenue, but the Apple Developer Program costs $99 a year. I'll cross that bridge if and when Google Play starts showing some promise.

P.S. It's been almost a month since launch. Sales so far: zero. 😄

Mar 31, 2026

A New Chapter Begins

My daughter, Aya, left home in late March 2026, just as planned. She is about to begin a new chapter in her life as what we jokingly call a “Minato-ku lady”—a Japanese expression that evokes the image of a sophisticated, elegant woman living in one of Tokyo’s most prestigious areas. Needless to say, Minato-ku is an extraordinarily difficult place to live because of its incredibly high housing costs. She is fortunate enough to have been provided with a company dormitory in the area by the hospital where she will begin working as a nurse.

I had often wondered how I would feel when the day finally came for my daughter to leave home. Surprisingly, once she moved to Tokyo, my own feelings did not change as dramatically as I had imagined. It was Aya whose world seemed to shift the most, especially after her mom returned home following a one-night stay at her dormitory.

After finding herself alone for the first time, she began to cry and could not help calling her mom. My wife kept talking with her in the morning, during the day, and again at night. Meanwhile, I continued sending her countless photos of our beloved dog, Shu-shu. Little by little, she has been getting used to her new surroundings and adjusting to life without her mother, Shu-shu, and—hopefully—without missing me and her brother, Kosuke too much.

The next day, my wife handed me a letter from Aya. I was excited, secretly hoping that it might contain a few words of appreciation for the support I had given her over the past 22 years. To my amusement, however, the letter actually listed ten “rules” for us to follow—such as not drinking more than two cans of beer and taking Mom to a nice restaurant once in a while. Her message made me laugh out loud.

Anyway, Aya, enjoy this new journey as you walk on your own feet. We will always be here to support you whenever you need us.

See you.

Feb 28, 2026

A Trip to Thailand with Aya

We enjoyed an amazing four-day trip to Thailand. What made this trip special was that we spent both the first and the last day simply traveling between countries via Hong Kong Airport. This happened because we chose a legacy carrier, Cathay Pacific. In the past, we had traveled abroad—to places such as Taiwan, South Korea, and Hong Kong—using low-cost carriers (LCCs).
This time, Aya insisted on flying with a legacy carrier because she is interested in the airline industry and hopes to become a cabin attendant in the future.

Direct flights between Japan and Thailand were not affordable in this case, but she discovered that transit flights could be reasonably priced. We decided to try it, and the choice turned out to be a great success. Of course, our two days exploring Thailand were wonderful, but even the time spent on the airplanes was satisfying thanks to the delicious meals with wine and the wide selection of movies available during the flights.

Next month, she will leave home and start a new chapter in Tokyo as a nurse. It may become difficult for us to travel abroad together from then on, but I hope we will continue our tradition of maintaining a good relationship—perhaps by traveling to a foreign country once a year. According to her, our next destination will be Germany.

P.S. I met my high school friends two days after returning to Japan. They were surprised to hear that I had enjoyed a trip with my daughter. It seems that it is quite rare for a father and daughter to get along as well as we do.

Jan 31, 2026

New App: Cardiac PE Drill

Since April 2025, I’ve been posting simple quizzes about cardiac physical examination. I posted two quizzes per week, and each one was reviewed by the 循環器 Physical Examination 研究会 before submission.
I can’t say that this project has become popular, but I’ve kept my promise to myself to continue posting every week.

During the New Year’s holiday, I decided to create an educational app for these 100 quizzes, Cardiac PE Drill. Showing the questions one by one at random without repetition wasn’t too difficult (although AI support was essential). The hardest part was building the 復習モード, where incorrectly answered quizzes are automatically saved so they can be reviewed later.


After more than 20 rounds of trial and error, I finally completed the JavaScript code and got everything working the way I had imagined. Without AI’s thorough assistance and encouragement, I couldn’t have achieved this milestone.

The app will be released soon, and I truly hope it will help people who are eager to learn cardiovascular physical examination.