Does Summertime Rendering anime have a happy ending?

The anime adaptation of Yasuki Tanaka's Summertime Rendering has received critical acclaim from fans of the manga all over the world.

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Hizuru Minakata, Summer Time Rendering Wiki

GREAT ENDING! Summer Time Rendering Episode 24-25 Reaction

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Summer Time Render

Summer Time Rendering, Summertime Render

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Can somebody explain the ending of Summertime Render to me? Why did Shinpei time travel one last time to a world where everything was okay, nobody was dead, and it seems like

Summertime Render - 25 (End) and Series Review - Lost in Anime

Does Summertime Rendering anime have a happy ending?