These are based on number of volumes sold in Japan for the past year.
List is put out via Oricon.
All of the series in the Top 10 of 2018 are licensed for English release.
10
Volume
Detective Conan: Zero the Enforcer
by Shima Mizuki
Released April 2018
131,790 Copies Sold
Series
No Game No Life
by Yuu Kamiya
Volumes released in 2018 – 1 (first in the main series since September 2016)
350,960 volumes sold
https://www.amazon.com/shop/justusr.stone?listId=EB8O6GQNDR0Z&ref=idea_share_inf
9
Volume
Is It Wrong to Try to Pick Up Girls in a Dungeon Volume 13
by Fujino Omori
Released February 2018
138,937 Volumes Sold
Series
Sword Art Online
by Reki Kawahara
Volumes released in 2018 – 0 (though volume 21 releases in December, after this list done)
371,626 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=K6EAF7QMJ8TY&ref=idea_share_inf
8
Volume
Konosuba God’s Blessing on This Wonderful World Volume 13
by Natsume Akatsuki
Released December 2017
143,251 Copies Sold
Series
Classroom of the Elite
by Shunsaku Tomose
Volumes released in 2018 – 3
393,949 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=2OLGOQ8KVRMR3&ref=idea_share_inf
7
Volume
The Irregular at Magic High School Volume 26
by Tsutomu Satou
Released August 2018
152,569 Copies Sold
Series
Sword Art Online Progressive
Volumes Release in 2018 – 2
by Reki Kawahara
Volumes released in 2018 –
426,794 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=2QVVO2Z5R277I&ref=idea_share_inf
6
Volume
No Game No Life Volume 10
by Yuu Kamiya
Released February 2018
161,121 Copies Sold
Series
The Ryuo’s Work is Never Done
by Shiro Shiratori
Volumes released in 2018 – 3
478,242 Copies Sold
https://global.bookwalker.jp/series/135449/
5
Volume
The Irregular at Magic High School Volume 25
by Tsutomu Satou
Released April 2018
166,745
Series
That Time I Got Reincarnated as a Slime
by Fuse
Volumes released in 2018 – 2 (3 if December 2017 is included)
539,277 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=20MZNG9LJ4XFH&ref=idea_share_inf
4
Volume
The Irregular at Magic High School Volume 24
by Tsutomu Satou
Released March 2018
170,766 Copies Sold
Series
Re:Zero Starting Life in Another World
by Tappei Nagatsuki
Volumes released in 2018 – 2 (3rd releases in December-not in this list)
619,031 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=Z88DD4VF3PBJ&ref=idea_share_inf
3
Volume
Sword Art Online Progressive Volume 6
by Reki Kawahara
Released May 2018
177,656 Copies Sold
Series
The Irregular at Magic High School
by Tsutomu Satou
Volumes released in 2018 – 4
626,952 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=2QDIFVSUU179N&ref=idea_share_inf
2
Volume
Sword Art Online Progressive Volume 5
by Reki Kawahara
Released February 2018
208,825 Copies Sold
Series
Konosuba God’s Blessing on This Wonderful World
by Natsume Akatsuki
Volumes released in 2018 – 3 (2 spin-off volumes also released)
630,889 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=2MQ6R9STONHSZ&ref=idea_share_inf
1
Volume
Overlord 13
by Kugane Maruyama
Released April 2018
240,361 Copies Sold
Series
Overlord
by Kugane Maruyama
Volumes released in 2018 – 1
807,693 Copies Sold
https://www.amazon.com/shop/justusr.stone?listId=FJJIQAPQSZY2&ref=idea_share_inf