As for watching "Gakuen de Jikan: Yo Tomare" online, the anime is available on various streaming platforms:

Do not chase the "online" mirage. Instead, purchase the digital version from DLsite (search for Rascou). Set up a Windows VM with Japanese locale. Apply the English fan patch. Experience the game as it was meant to be played—not in a browser tab, but on a desktop, with the eerie ticking of a frozen clock in your headphones.

"Stay," he whispered to the silent air, knowing she couldn't hear. "Stay exactly this happy."