Where it comes from
The line in the source
"productTitle": "ハイクラスパック「THE BEST OF XY」", "releaseDate": "2017年 4月21日（金）", "description": "カード15枚入り（うち、キラカード2枚入り）" Explore / Figure
Record
JP expansion-pack release date, 21 April 2017 | 2017 | year to February 2018 (Mar 2017-Feb 2018) | print-year Apr 2017-Mar 2018
21 April 2017 21 April 2017 | 2017 | year to February 2018 (Mar 2017-Feb 2018) | print-year Apr 2017-Mar 2018
FiledTaken from a filing, a registry or the company’s own published page.
Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.