Seen everything by Takashi Watanabe?
If you've already watched everything Takashi Watanabe directed, here are 12 films from other directors that share the orbit of Shakugan no Shana: The Movie — the catalog's mood-cluster and similarity-graph neighbours, filtered to exclude Takashi Watanabe's own filmography. Where to go next. (Also: Takashi Watanabe's full filmography · where to start with Takashi Watanabe.)
Overlord: The Undead King
Death Note Relight 2: L's Successors
The Garden of Sinners: Paradox Spiral
Overlord: The Dark Hero
The Garden of Sinners: Remaining Sense of Pain
Gurren Lagann The Movie: Childhood's End
Inuyasha the Movie: Affections Touching Across Time
Inuyasha the Movie 2: The Castle Beyond the Looking Glass
Futari wa Precure Max Heart Movie 2: Friend of Yukizora
Bleach the Movie: Fade to Black
Beyond the Boundary: I'll Be Here – Past
Beyond the Boundary: I'll Be Here – Future