These rankings are series rankings, not volume rankings. It also only includes series that have had new volumes released in the past year. The overall rankings list (the top one) has gaps as things that are not light novels (mostly manga) have been left out. This treatment has not been applied to the literature rankings, so there are a couple of non-light novels on there.
These rankings cover bookwalker ONLY but this is a major source of light novel sales, so is worth including despite being limited to a single site.
Obviously this is the Japanese bookwalker, not the global one.
The site as a whole seems to have shifted in favour of manga sales rather than light novels, based on these rankings.
Figures in brackets are last year’s rankings when appropriate.
*3. Kono Subarashii Sekai ni Shukufuku wo! (3)
*4. Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka (4)
11. Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e (12)
15. Mahouka Koukou no Rettousei (7)
16. Sword Art Online
21. Tensei Shitara Slime Datta Ken (9)
38. Goblin Slayer (19)
39. Yahari Ore no Seishun Love Come wa Machigatteiru.
41. Ryuuou no Oshigoto (13)
45. Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka Gaiden: Sword Oratoria (24)
Light novel rankings below the above:
11. Isekai Maou to Shoukan Shoujo no Dorei Majutsu
12. Date A Live
13. Saenai Heroine no Sodatekata
14. Youjo Senki
15. Death March kara Hajimaru Isekai Kyousoukyoku
16. Strike the Blood
17. Hataraku Maou-sama!
18. Shin High School DxD
19. Seirei Gensouki
20. Accel World
1. Monogatari Series (1)
2. Kyokou Suiri
3. Haunted Campus (7)
4. Ima sara Tsubasa to Iwaretemo
5. Kakuriyo no Yadomeshi (8)
6. Watashi no Shiawase na Kekkon
7. Asakusa Oniyome Nikki
8. Ura Sekai Picnic
9. Houkago Chikyuu Boueigun
10. Kamisama no Goyounin
11. Shousetsu Tenki no Ko
12. Kouka Koukyuu Monogatari (20)
13. Bonkura Onmyouji no Oniyome
14. Isekai Izakaya “Nobu”
15. Shijinsou no Satsujin Series
16. Mardock Scramble
17. Veldman Kasetsu
18. Hon to Kagi no Kisetsu
19. Evangelion Anima
4. Hito wa Shishi no Koi wo Shiranai
5. Stalker Kishi no Seijitsu na Kyuukon
7. Ouji-sama ni Dekiai Sarete Komattemasu
12. Gin no Kishi wa Isekai Maid ga Okiniiri
13. Josei ga Nigite na Danchou-sana to, Dansou Youjinbou no Kuroneko
14. Kishi wa Kaikon ni Naku
15. Doushiyou? Wakaokusama wa Kyou mo Pinch desu!
17. Koushaku Reijou no Konkatsu
As with last year there are no BL light novels in this year’s rankings.