A Certain Magical Index Episode Ratings Heatmap
2008 · 3 Seasons · 74 Episodes · Overall Score: 6.9/10 (24 rated)
Season 1 holds the highest collective average score across the series.
Season 1 Details →Lowest score variance (σ = 0.68), maintaining an average of 6.9.
Season 1 finale: "Imaginary Number School District - Five-Element Agency"
Episode Recap →Complete Episode Rating Matrix
Interactive score chart by season and episode number. Darker green indicates higher ratings; amber and red denote lower reception.
| Episode | Season 1 | Season 2 | Season 3 |
|---|---|---|---|
| Ep 1 | 7.4 | – | – |
| Ep 2 | 7.4 | – | – |
| Ep 3 | 7.4 | – | – |
| Ep 4 | 7.2 | – | – |
| Ep 5 | 7.4 | – | – |
| Ep 6 | 7.4 | – | – |
| Ep 7 | 7.0 | – | – |
| Ep 8 | 7.2 | – | – |
| Ep 9 | 7.5 | – | – |
| Ep 10 | 7.1 | – | – |
| Ep 11 | 7.2 | – | – |
| Ep 12 | 7.3 | – | – |
| Ep 13 | 7.0 | – | – |
| Ep 14 | 5.8 | – | – |
| Ep 15 | 5.3 | – | – |
| Ep 16 | 5.6 | – | – |
| Ep 17 | 6.9 | – | – |
| Ep 18 | 7.1 | – | – |
| Ep 19 | 5.6 | – | – |
| Ep 20 | 7.0 | – | – |
| Ep 21 | 7.1 | – | – |
| Ep 22 | 7.1 | – | – |
| Ep 23 | 7.3 | – | – |
| Ep 24 | 5.9 | – | – |
| Ep 25 | – | – | – |
| Ep 26 | – | – | – |
| Season Avg | 6.9 | – | – |
Ratings Analysis & Trajectory
Across 3 seasons and 74 episodes, A Certain Magical Index has earned an overall series rating of 6.9 out of 10. The series displays remarkable consistency across its narrative arc, maintaining reliable ratings from premiere to conclusion.
The single highest-rated hour of television in the series is Season 1, Episode 9 ("Deep Blood (Vampire Killer)"), rated at an extraordinary 7.5/10 with 8 ratings. Conversely, the lowest-rated installment is Season 1, Episode 15 ("Angel Fall (Angel Fall)"), landing at 5.3/10.
The most precipitous single-episode shift occurred in Season 1 between Episode 18 ("Replica (Impostor)", 7.1) and Episode 19 ("Last Order (The End)", 5.6), a swing of 1.5 points.
Top 10 Highest Rated Episodes of A Certain Magical Index
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 1, Ep 9 | Deep Blood (Vampire Killer) | 7.5 | 8 | Nov 30, 2008 |
| #2 | Season 1, Ep 1 | Academy City | 7.4 | 12 | Oct 5, 2008 |
| #3 | Season 1, Ep 2 | Innocentius (The Witch Hunter King) | 7.4 | 10 | Oct 12, 2008 |
| #4 | Season 1, Ep 3 | Necessarius (The Church of Necessary Evil) | 7.4 | 10 | Oct 19, 2008 |
| #5 | Season 1, Ep 5 | Limit (12 o'clock) | 7.4 | 9 | Nov 2, 2008 |
| #6 | Season 1, Ep 6 | Imagine Breaker | 7.4 | 9 | Nov 9, 2008 |
| #7 | Season 1, Ep 12 | Level 6 (Absolute Ability) | 7.3 | 7 | Dec 21, 2008 |
| #8 | Season 1, Ep 23 | Friends (Hyoka Kazakiri) | 7.3 | 7 | Mar 12, 2009 |
| #9 | Season 1, Ep 4 | Perfect Memory Ability | 7.2 | 10 | Oct 26, 2008 |
| #10 | Season 1, Ep 8 | Ars Magna (Golden Transmutation) | 7.2 | 8 | Nov 23, 2008 |