Brave And Undead Are Too Careful

Brave And Undead Are Too Careful (勇者と不死者が慎重すぎる) is a collaboration game event in Mass for the Dead with characters from Overlord and The Hero is Overpowered but Overly Cautious. It will be released on September 15, 2020 to October 15, 2020.

Background
During a summoning experiment by a reaction of the Throne of Kings with the Chaos Stones. This time, three goddesses and one hero appeared in front of Momonga. The goddesses should also be careful, but the reaction, behavior, and judgment immediately after the summoning, the brave man was too cautious as Momonga was wary.

Incident
In the Divine Realm, Seiya Ryuuguuin has finished his morning run, stopping by where Valkyrie is who comments on his preparedness. The hero deciding to take a break, gives Valkyrie the opportunity to draw a sketch of him. She tells him not to move so she can finish her "masterpiece' not wanting a repeat of what happened when Crossed Thanatos destroyed her last painting.

The two are soon joined by Ristarte who is curious to see what they are doing. Seiya claims that he initially wanted to resume training but now is forced to act as a exhibitionist for a talent-less goddess. Ristarte scolds him for saying such language and to bear with it as senior goddess could erase a world. Seiya asks what she is doing at the rooftop, which the goddess claims to be taking a break after trying to do her 'best' when she felt she tried to hard and damaged her skin. Seiya doubts the effort she putted in. The talk annoys Valkyrie who is still trying to paint her picture, telling the interfering goddess to be quiet. A third joins them soon, Adenela who has been seeking Seiya so he can live up to his promise to spend with her on his next visit to the Divine Realm when she helped him against Crossed Thanatos. The hero objects as the deal was that she stopped him and which she failed in doing so. This infuriates Ristarte as he cannot go back on his word.

Valkyrie having enough of the interruption goes in an outburst, when a Crack manifests before the group. While the three deities are confused by the phenomena, Seiya on instinct impales a sword into the ground. The reason for it soon becomes clear when the crack in space begins sucking the goddesses into it. They are grabbed from the air by Seiya who is using the sword to ground himself. Ristarte is surprise by his initiative asks how he could predict such a thing was going to happen, but is given an answer that Seiya did not, and only assumed that the Crack was a threat. Before he could give orders to Valkyrie to use her [Valhalla Gate], a sudden sword slash comes from the Crack and cuts through, damaging Seiya's blade connecting to the ground. Through the Crack, Seiya sees the form of an undead wielding a scythe lurking on the other side. It attacks again with a sword slash and the blade Seiya is holding onto is destroyed, and with it the last support holding the group to the ground. They are sucked through the depths of the Crack in a blink of an eye.

Meanwhile in the Great Tomb of Nazarick, another annual summoning experiment is initiated using Chaos Stones and the remains of the Throng of Kings. The Crack then spits up the three goddess in a heap. Ristarte who was just about to get back on her feet, finds herself used as a cushion by Seiya. Upon landing on his partner the hero is glad to know that the ground is safe as it has yet to dissolve the goddess to the latter's indignation as being used as a foothold to check the environment. The goddess is allowed to get up and survey her surrounding which to her discomfort appears to be in the midst of a flock of undead. Seiya seeing the situation decides to call for a hasty retreat and orders Ristarte to summon a [Gate] to esacpe. A [Gate] portal soon appears in the Throne Room, but before the group can go in, Seiya stops them to check if its safe. Using a pebble he tosses one into the [Gate], only for the portal to spit out the object into Ristarte's face. Seiya out loud wonders why the [Gate] is not working properly and asks his companions if they know or seen anything like the Crack, but they are unable to give him an answer only for Ristarte they might not be in the Divine Realm anymore. The thing they cam through seemed similar to a [Gate], but should not be possible for three goddesses to descend into the world simultaneously.

In a irregular situation, Seiya spots Demiurge and Momonga calmly observing the party. Momonga decides to introduce himself as the ruler of the Great Tomb of Nazarick and offers to answer any questions they have on this strange occurrence. Valkyrie however is not in the mood for listening as seeing their calm demeanor accuses them of being the cause of the Crack that brought her and her friends to this place. Most of all she holds them responsible for destroying her work of art that she painstaking worked on and was lost in the commotion. Finding it unforgivable she prepares to attack, but is stopped by Seiya stating they cannot afford to lose her now. Mistaking this to be a form of declaration of love, the other women swoon at the statement, though Seiya in truth did not want to let their party's strongest member go to waste but lets the women think otherwise so to remain discreet on Valkyrie's power. Seiya calmly assesses the situation they are in, commenting that the ones in front of them might not be responsible. And while they look like undead, this world is not Gaeabrande so in logic undead here might be different in their previous world and possibly not hostile. They should then try to avoid starting hostilities as they might be more powerful than them as this world's laws might just make goddesses vulnerable as they could have instant death magic. Valkyrie seeing his point and pacified by his earlier statement concedes. Momonga watching from afar is surprised how intuitive the young man is as he was just preparing his death magic [Grasp Heart] should the situation turned south. But now that the undead has the strangers undivided attention he then believes he should get to the start and ask how they came to their world.

After sharing information on what they deem acceptable, Seiya and Momonga still regard each other with caution. Though the hero understand that his comrades are in another world, and according to the Overlord, the summoning phenomena that brought them through the Crack was not caused by Momonga to intentionally spirit them away. However it seems that their experiment may have been the trigger of sort for the Crack. Ristarte inquires about the mysterious undead they saw in the Crack which apparently the beings of Nazarick have no idea who that was. Seiya doubts Momonga's truthfulness and considers the possibility of him lying to them. But also brings the possibility that there is another enemy out there that seeks to do them harm from the Crack. He is even more wary of the Overlord as his [Ability Perception] is unable to read the status of the former making him think that Momonga is a similar existence to Crossed Thanatos. Likewise Momonga is wary of the new arrivals.