Union Arena The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You vs That Time I Got Reincarnated as a Slime booster box: which is worth opening?
Neither is worth opening at today's prices, but The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You comes closer: its cards are worth 72% of its price after selling costs, against 54% for That Time I Got Reincarnated as a Slime.
Side by side
| The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You booster box | That Time I Got Reincarnated as a Slime booster box | |
|---|---|---|
| Verdict | Keep it sealed | Keep it sealed |
| Box price today | $156€139 | $162€145 |
| Cards inside, after selling costs | $113€101 | $88€78 |
| Cards ÷ price | 72% | 54% |
| Boxes that lose money | 83 of 100 boxes | 83 of 100 boxes |
| A typical box (median) | $58€52 | $46€41 |
| Rarest pull | Alt-art parallel (★ / ★★): 66 of 100 boxes | Alt-art parallel (★ / ★★): 66 of 100 boxes |
| Packs | 16 packs of 12 cards | 16 packs of 12 cards |
| Released | July 10, 2026 | June 26, 2026 |
The two boxes
How we work this out
Both boxes are worked out the same way: today's card prices, selling costs taken off, and simulated boxes to see how often one loses money. Read the full method