List is compiled from the Oricon website.
10. 7,879 Copies Sold Seirei Gensouki Volume 13
精霊幻想記 13. 対の紫水晶
Serei Gensouki: Spirit Chronicles
https://www.novelupdates.com/series/seirei-gensou-ki/
9. 8,511 Copies Sold Seirei Tsukai no Blade Dance Volume 20
精霊使いの剣舞 20 共鳴の聖魔剣
Blade Dance of the Elementalers
https://www.novelupdates.com/series/seirei-tsukai-no-blade-dance/
No English license for the light novels
8. 10,104 Copies Sold Date A Live Volume 20
デート·ア·ライブ 20 十香ワールド
https://www.novelupdates.com/series/date-a-live/
No English License for the light novel series.
7. 10,408 Copies Sold Isekai Cheat Magician Volume 9
異世界チート魔術師 9
Fantasy World Cheat Magician
https://www.novelupdates.com/series/isekai-cheat-magician/
No English License for the light novel series.
6. 11,257 Copies Sold Hachinan tte, Sore wa Nai Deshou! Volume 16
八男って、それはないでしょう! 16
Eighth son, I don’t think so!
https://www.novelupdates.com/series/hachinan-tte-sore-wa-nai-deshou-ln/
No English license for the light novel series. An anime is in production
5. 13,103 Copies Sold Re: Zero Kara Hajimeru Isekai Seikatsu Tanpenshuu Volume 4
Re:ゼロから始める異世界生活 短編集 4
Re:Zero Starting Life in Another World
Short Story volume. Not currently licensed.
4. 16,508 Copies Sold Isekai Shokudou Volume 5
異世界食堂 5
Restaurant to Another World
https://www.novelupdates.com/series/the-other-world-dining-hall-wn/
Licensed for English release by Seven Seas
3. 18,025 Copies Sold Psychic Detective Yakumo Volume 10
心霊探偵八雲 10 魂の道標
Shinrei Tantei Yakumo
https://www.novelupdates.com/series/shinrei-tantei-yakumo/
No English License for the light novel series
2. 30, 746 Copies Sold Re:Zero Kara Hajimeru Isekai Seikatsu Volume 19
Re:ゼロから始める異世界生活 19
Re:Zero Starting Life in Another World
https://www.novelupdates.com/series/rezero-kara-hajimeru-isekai-seikatsu/
Licensed for English release by Yen On
1. 63, 237 Copies Sold Tensei Shitara Slime Datta Ken Volume 14
転生したらスライムだった件 14
That Time I Got Reincarnated As A Slime
https://www.novelupdates.com/series/tensei-shitara-slime-datta-ken-ln/
Licensed for English release by Yen On