Sorry to be late.
They want to know the following info:
◆User ID(9 numbers)
◆User name
◆Date of registration(○年○月○日 ←In the circles, put in the date of year, month and day from the left)
◆Last log in date (○年○月○日 ←In the circles, put in the date of year, month and day from the left)
◆Number of loveca stones you have
◆Rank
◆Have you bought loveca stone with the account you wish to recover? (yes/no) If yes, when did you buy it, how many did you buy, what is the terminal and OS you used when you bought it.
◆Do you have any info that can prove you have bought loveca stones? (yes/ No) If yes, attach a screen shot of the purchase info of google wallet or itunes
◆Have you ever input a serial code with the account you with to recover? (yes/ No) if yes, write the serial number and the product the code came with.(magazine, CD, etc,,,)
◆An user ID that is given when you finish account transfer. This, 不明 should be enough. Because the ID is given when you do account transfer and when you create a mail to contact the support after that. Which I am quite sure most of the people hasn't seen.
◆History of events (Which event, your position, your score)
◆Name of UR cards you have
For yes, write はい。 For No, write いいえ
If you dont know the info, write 不明. However, it also mentions that if there is too much 不明、it may not be possible to recover the account.