[High Difficulty] The Librarian's Job

"The Diary of Lady Murasaki"
Passive 1: Book Return: Upon death effect [Permanent, Unremovable] - Apply Ignore Invincible to Murasaki Shikibu (1 turn). Increase ATK for Murasaki Shikibu by 100% (1 turn). Apply delayed debuff on all enemies (1 turn): Decrease Critical Star Drop Rate by 50% at the end of the turn (1 turn).
Passive 2: While on the field, restore Murasaki Shikibu's HP by 15,000 at the end of each turn. [Permanent, Unremovable]
Passive 3: When 4 turns pass, inflict Stun on a random enemy (3 turns). Inflict Death upon self. [Demerit]

Special Skill: Check Out "The Diary of Lady Murasaki": After turn 2, can summon another [The Diary of Lady Murasaki] if one is no longer on the field. This will subsequently summon another [The Tale of Genji] to the field.

Upon Break: "Will You...Tell Me What You Thought?": Increase own HP Recovery Amount by 100%.
Battle ends upon defeating Murasaki Shikibu.

"The Tale of Genji"
Passive 1: Book Return: Upon death effect [Permanent, Unremovable] - increase NP Gauge of Murasaki Shikibu by 3, and inflict a debuff on all Female enemies (1 turn): Apply Charm (1 turn) at the end of the turn.
Passive 2: While on the field, increase Damage Resist to all attacks for Murasaki Shikibu by 80%. [Permanent, Unremovable]
Passive 3: When 4 turns pass, apply Nullify Buff to all enemies (3 turns). Inflict Death upon self. [Demerit]