If the RPG World Had Social Media..., Vol. 1 (manga)

When a fantasy world has fully functioning internet and smartphones (forsome reason), it's only natural for its sixteen year-old shut-in of a Hero todeclare war on the Demon Lord who has kidnapped the kingdom's princess via textmessage. But is it natural for that Demon Lord to be an innocent snowflake whohates conflict!!? And somehow, this hopelessly weak Level One Hero ends uptexting this overly pure Demon Lord, her cheerful Generals (who all adore her),and the princess who also seems to be developing a major crush on her captor ashe goes about his adventures!