Breakthrough Upgrade (限界突破)

A Breakthrough Upgrade (限界突破) (げんかい　とっぱ "genkai toppa", literally "limit breakthrough") allows you to expand a player's maximum Player Experience Level (選手レベル). You achieve it on the same page as the Special Training Boosts (特訓).

You can do this 1 of 3 ways: Other notes:
 * Use a duplicate of your player that is the same rank (example, using a B-rank Murakami to upgrade a B-rank Murakami.
 * Use a duplicate of you player 1 rank below but at the maximum Player Experience Level (for example, using a C-Rank Murakami at level 40 to upgrade a B-Rank Murakami).
 * Use a Breakthrough Coach (限界突破コーチ) that matches your player's rank (only exists for B, A, and S rank)
 * If a player is available, it will show up first and highlight on the Special Training Boosts (特訓) list.
 * If a player qualifies for a Breakthrough Upgrade, it will succeed, there is no chance of success like Special Training Boosts (特訓).
 * You can do this up to 5 times. S: 70 to 75, A: 60 to 65, B: 50 to 55, C: 40 to 45, D: 30 to 35.
 * You can do more than 1 at a time, but make sure they don't add up to beyond 100% chance of Special Training Boosts (特訓) upgrade if it can apply.
 * Once a Player Experience Level goes above the original limit, the Basic Skills do not increase, but the Spirits (スピリッツ) do.

Tip: Make sure the person you are spending in the upgrade is not a newer Player Series, which usually have higher Spirits.