Volume 15, part 3:
50% - "Oh, and now that I think about it, you even have {Ultra Transformation}. A splendid skill that lets you die three times per day.
According to the known skill levels for Ultra Transformation, at level 3 Keima can die and revive once every 72 hours. So should it be something like "A splendid skill that lets you die and revive once every three days".
Volume 5, Epilogue: — Level 3: Once per 72 hour period, if you die while transformed, you can revive by undoing the transformation.
