United Front & Terminus Library

 is the fiftieth chapter of the Trinity Seven manga series, released on January 9, 2015 in the Monthly Dragon Age February 2015 issue and later compiled in the twelfth volume on August 8, 2015.

Summary
On the second day of the Royal Biblia Academy Magical Research Festival, Yui and Arin learn of Arata, Akio and Levi's disappearance in the Headmaster's office. Master Biblia notes that the three were probably defeated the night before during the Underground Magical Research Tournament. Confirming the culprits as Akarsha Academy, Yui is determined to save Arata, however, Hijiri arrives to warn them along with Lugh, much to the group's shock. After greeting the Headmaster, Hijiri proposes an alliance with the remaining members until they rescue Arata, although Selina remains wary of Iscariot after their previous assault. While Hijiri is unsurprised by their reaction, Arin states that she will trust them since Hijiri's feelings for Arata are legitimate. Hijiri reminds the Trinity Seven of Ira that she stole Arata, but Arin nontheless claims that she will then steal him away from her. As such, the two agree to become allies temporarily for Arata.

Outside in the festival, Arsha is enjoying herself with various treats, although Mira quietly follows her. Using her grimoire, she detects an anomoly in the Academy where Arsha is located.

Arriving at the location of the disturbance, Mira initially does not discover anything unusual, but upon casting her magic, she suddenly finds herself at Arsha Academy. When confronted by a Garm, Mira easily dispatches the creature, before Arsha approaches the Trinity Seven to greet her. Mira demands that Arsha return Arata and the others, but the Paladin remarks that she has already uncovered the Trinity Seven's weakness, summoning her grimoire and weapons. Arsha then throws one of her swords toward Mira who easily blocks her attack, but the sword unexpectedly transform into slime, devouring Mira's magic and clothes. Despite her victory due to Mira's sensitivity to eroticism, Arsha is surprised when Mira quickly dispells the slime while also uncovering her Thema, Arbiter. Revealing that she has been accustomed to lecherous situtations due to a certain someone, Mira then prepares to continue fighting agaisnt Arsha.

Character

 * Yui Kurata
 * Arin Kannazuki
 * Master Biblia
 * Selina Sherlock
 * Lieselotte Sherlock


 * Hijiri Kasuga
 * Lugh
 * Arsha
 * Mira Yamana

Trivia

 * Trinity_Seven_calander_cover_Montly_Dragon_Age_Feb_2015_MZ.jpg cover of Monthly Dragon Age February 2015 featured an advertisement for the Trinity Seven calendar, along with Eriri Spencer Sawamura and Utaha Kasumigaoka from Saekano: How to Raise a Boring Girlfriend.
 * Additionally, a Trinity Seven theme 2015 calandar was included with the issue, containing illustrations for each month.
 * Yui, Arin, Lieselotte & Selina discuss with the Headmaster about the previous night's where Arata, Akio and Levi were captured by Akarsha Academy during the Undergound Magical Research Showdown. This is a reference to events in previous chapter where Ako and Levi were captured by Arsha and Arata fell under Anastasia-L's control.
 * When Hijiri interrupts the group, she mentions to Master Biblia that they had not met since she last attacked the academy, which initially begain in Fianna Knights & Invidia Magus.