Ok the manga is... I have to say this, really bad. Not only the artist changed the timeline but also details here and there, which make the manga confusing. Not to mention, Vaito has a lot of inner dialogue (same with Emiya Shirou from Fate) and the manga fails so hard at incorporating that, which twists his character (again, like Shirou)... The novel is honestly much better, not saying it's like a majestic masterpiece or something but definitely very enjoyable and much better than the manga version.