Senpai no Sotsugyoshiki

In 2019, a large typhoon severely damaged Chikuma City. After that, the coronavirus attacks the city. Takumi-senpai, whom Ayaka had been thinking about, disappeared from the city without a graduation ceremony, leaving behind saying "Ayaka has a story". One day, her best friend Kaoru finds Takumi-senpai livestreaming.
His appearance has changed too much.
Ayaka participates in the live stream and she sends a message saying "I will reveal your secret".
(source: YouTube)