LittleMass

LittleMass was an idol group of the Great Tomb of Nazarick in Mass for the Dead.

Background
After the protagonist was hailed a hero for driving away the Demon Emperor Jaldabaoth from E-Rantel, the homunculus hero brought a proposal to Momonga and the other Floor Guardians that it was in Nazarick's interest to care for the well-being of the fortress city. Having made tours to the new and old sections of E-Rantel, the protagonist made an observation that while humans and demi-humans coexisted in the new section, there were many people were still suffering from trauma of the Catastrophe in the old section. If left unattended it could lead to a possible conflict between the two areas of E-Rantel. To avoid that scenario it was decided that not just physical assistance to the city was needed but to provide mental relief. It also prompted an opportunity to seize the hearts of human inhabitants. Among the ideas of what method they should use, it was Momonga's suggestion of using idols that was put to play.

Mass for the Dead Arc
Before implementing the idol event in E-Rantel, a trial run was agreed to be done within the Great Tomb of Nazarick and for the Homunculus Maids in consideration that they were similar to humans and to reward them for their efforts in maintaining Nazarick. Though it was suggested that the Pleiades would make good idols for this event, the roles were given to the Floor Guardians as the battle maids already had many missions to follow-up on. Two Floor Guardians were selected for the idol singers and made their surprise debut at the cantina on the 9th Floor where they gave a small show to the general maids.

Demiurge acting as the producer for the idol show and the protagonist as the manager together did some research on idol singing shows. In order to give the general maids a truly interactive experience Demiurge wanted to do a live idol show in a setting where the homunculi would feel a foreboding environment and be uplifted in spirit by the idols. The ruined Throne Room was selected to be perfect with the idols not just singing but also battling against the Chaos Beasts that emerged periodically. The plan was proposed to Momonga, though he had reservation of putting non-combatants in danger but after measures were taken to ensure the security and safety of the spectators, the Overlord consented to the plan. To test out the live idol show, a trial run was agreed before taking the show on the 10th Floor.

To start the first actual live idol performance took place on the 6th Floor in front of the Crack anomaly there. The event turned out to be a success by Momonga who viewed the scene via his undead summon. Plans to proceed to the show on the 10th Floor were approved and also the start of creating idol merchandise for the maids.

Strength
The idol unit was composed of two members of the Floor Guardians selected due to their appeal to the human demographic and cuteness. Despite that the two young women are capable of singing and battling simultaneously when doing their performance. Though their lyrical works were provided by music specialist such as Neuronist Painkill and Chacmool.

Known Members

 * Demi P (Producer)
 * Protagonist (Manager)
 * Alkaline (Idol)
 * Acidity (Idol)

Trivia

 * The idol group may be a reference to Overlord: The Undead Oh! when characters from the manga believed that Mass for the Dead was an idol training game.
 * The stage names of the idols relate to the pH value of water.
 * Jūami, the artist for Overlord: The Undead Oh! expressed her wish two years ago of wishing "Obamasu was an idol training game".