Trinity Seven: 7-nin no Mashotsukai The Novel
Everyday is a normal day in the small town where Kasuga Arata lives. However, everything changed on the day of the Black Sun, and following it, a magician appears before him. The Black Sun caused the Breakdown Phenomenon which destroyed the town where he lives. Because of this, his normal life was artificially reconstructed by a Grimoire that his childhood friend had left. Just what is the purpose of the magician coming to the town? What will he do with the Grimoire's keepsake?
Trinity Seven The Novel is a Side-Story series focusing on the various heroines in the main story including their pasts, modern events, and so on.
I'm a fan of the Trinity Seven manga series and would love for more of the Trinity Seven series to be licensed. The second volume of this Novel Side-Story series was adapted into the movie and it's authored/illustrated by the same combination as the manga. It's overall a really cool novelization side-story. Yen Press already has the manga but there isn't much hope in them picking up stuff like spin-offs for anything other than their money printing series. (Like Re:Zero)
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