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This volume contains the following tropes:
- Anguished Declaration of Love: Yoshino uses her privilege as the victor of the battle royale to give the former to Shido, seemingly awkwardly timed as Tohka's about to disappear. Tohka can no longer hold back her emotions after hearing Yoshino’s confession (which was likely Yoshino's intent) and gives a combination of this trope and Dying Declaration of Love, leading to Shidō also breaking down and giving an anguished one as well.
- Armor-Piercing Question: Natsumi gives one to Mukuro that makes her reconsider teaming up with Nia.Natsumi: “I don’t regret my actions. Even if I am defeated here, I am satisfied. ──What about you Mukuro? Being manipulated by Nia and surviving until the very end, even if you get the right to confess could you stand proudly in front of Shidou?”
- Broken Masquerade: By using Rasiel, Kurumi discovers the truth of the fake world and snaps everyone else out of it.
- Call-Back: During their date, Tohka and Shido find the street where they first met and reenact their first interaction for laughs. Later, they visit the classroom where Shido named her, which also ends up being where her Inverse form would receive the name Tenka. Like Tohka, she engraves it onto the chalkboard to learn how to write it.
- Cool Big Sis: Tenka is one for Tohka. Even using Mio's power just to make sure Tohka can enjoy her last moments happy.
- Disproportionate Retribution: A comedic example occurs when Shido shows Tohka and Tenka cherry blossom trees. Tohka sneaks up behind Tenka to coat her in petals, and gets petals thrown back at her in playful retaliation. When Shido does the exact same thing, Tenka picks up pebbles and chases after him.
- Everybody Cries: During Tohka's final moments.
- Fusion Dance: Tohka and Tenka merge together to fight the defense instinct of Mio's Crystal. Tohka's in control, wielding both of their swords, while Tenka is a voice in her head.
- Hidden Heart of Gold: Tenka claims that she took Mio's Crystal and created a parallel world just for the experience of the latter's godlike power. She really just wanted to stretch out Tohka's remaining time for as long as possible.
- I Let You Win: Kurumi wasn't actually defeated by Yoshino; she just wanted to save some power to rewind Mana's body to a point before she became a Wizard with a shortened lifespan.
- If You Ever Do Anything to Hurt Her...: Tenka bluntly tells Shido that his head's coming off if he doesn't keep Tohka happy during their date, though she (very reluctantly) relents when Tohka chastises her for her threats.
- Last Kiss: Shidō and Tohka kiss right before the latter disappears.
- Lighthearted Rematch: During the battle royal, Kotori and Origami pick up where they left off in their duel since Volume 4.
- Literal Split Personality: Inverse Tohka (Now named Tenka) gets a body of her very own by using Mio's power.
- Living on Borrowed Time: In order to extend Tohka's time, Kurumi proposes a plan to gather as much spirit power possible with a battle royal with the winner having the right to confess to Shido as extra motivation.
- Marry Them All: Discussed by Miku during her battle against Yoshino. She states that as much as she loves Shido, she loves the other girls as well and wants to find a way for them all to be married to him.
- The Magic Goes Away: Due to Mio's death, the Spirits' powers disappear, reverting them back into humans and causing Tohka, a pure spirit, to disappear. Kurumi also reverts Mana's body to a state before DEM's treatment, stripping her of her Wizard abilities but salvaging her shortened lifespan.
- Meet Your Early-Installment Weirdness: Given Tenka's personality is essentially Tohka's when she first appeared, their interactions with each other have shades of this.
- Morton's Fork: Once Mio’s defense instinct can no longer be suppressed, Tenka is left with the choice of either getting killed by it or defeating it, which is equivalent to breaking Mio’s Crystal and will end her life anyway.
- O.O.C. Is Serious Business: Yoshino stuns everyone when she removes Yoshinon before confessing her feelings to Shido.
- Stepford Smiler: Tohka knew from the moment she summoned Tenka that she was soon going to disappear, yet retains her usual cheerfulness so Shido won't worry about her during their date.
- Too Good to Be True: In the world Tenka created, Ratatoskr was successful in restoring Mana's lost life span and Kurumi's friend Sawa is alive as well.
- Sequel Hook: Volume ends with the cast returning a few minutes after the end of volume 19, but with Tohka gone.
- Year Inside, Hour Outside: The month spent in Tenka's world was only 3 minutes in the real world.
