Namco ✕ Capcom (pronounced "Namco Cross Capcom") is a 2005 PlayStation 2 game developed by Monolift Soft (of XenoSaga fame) in cooperation of Namco and Capcom.
For plot convenience, only chapters which feature Resident Evil characters are described in depth, and any with passing mentions will be summarised. Other Wikis may fill in the missing chapters.
Ten years prior to the game's start, Shibuya, Tokyo was the battle ground for two mysterious organizations over the development of a transdimensional gateway. The ancient Shinra organization, answering to the Japanese government, succeeded in deactivating the gateway, knowing full well the threat the other universes would have on the Earth of the Material World. In the present, the transdimensional tremors begin anew, with monsters appearing all over the world. Agents Reiji Arisu and Xiaomu are sent out to the sealed-off Shibuya to begin their investigation into the spacial anomalies. Too much for Shina to handle, US-STRATCOM is ordered to reinforce the organization, though are yet to arrive. The mysterious Shadaloo organization also has interests in the events, and the tremors cause three people from the future - MOMO, Shion and KOS-MOS - to wind up in Tokyo.
In the present day Material World's "Metro City", martial artists Ken Masters and Ryū discuss a warning Ryū received from Gouki in Japan. They suspect Shadowloo is up to something, and rumours of Interpol agent Chun-Li going off on a mission convince them they must head for Japan.
In the "Material World", Bruce McGivern and Fong Ling are traveling on board a cruise ship, a sister of the Spencer Rain. Mentioning their last mission together, Bruce declares it to have never happened in US-STRATCOM's eyes, so decides just calling this ship the Spencer Rain is much easier. They move on to discussing a woman Fong Ling is keeping an eye on, who she is unsure whether or not is infected with the t-Virus. Asking what either of them are doing on the ship, Fong Ling reveals she is heading to Japan to investigate Shadowloo alongside Interpol, and Bruce McGivern is here to recover a Third Energy data disc hidden somewhere on the ship. The two agree not to get in each other’s way.
In another realm, Joker; the Red Arremer Joker and Druaga talk in the Tower of Druaga. Joker reveals his responsibility in causing the interdimensional tremors in order to harvest life energy from the Material World to use in a ritual.
Back on the Spencer Rain, zombies have suddenly overrun it. In the ruckus, Bruce discovers SORT agent Regina, who is also after the Third Energy data disc. The two ease their tensions when concluding that neither is a Shadowloo agent. Hearing noises on deck, the three reunite outside, where they meet Hsien-Ko, a Jiang-Shi from the 18th century. Hsien-Ko warns them to evacuate the ship immediately ahead of a demon attack. Rather than abandon ship, the three agents choose to fight the demons, where they soon after meet the zombie rock star, Zabel. After making it very clear his (unrequited) love for Hsien-Ko, he reveals himself to have been behind the zombie invasion of the ship. About to run inside, the three are reinforced by martial artists Devil Jin, Ryū and Ken Masters (the latter of whom Bruce recognises as an American martial arts champion), who have finished defeating the zombies within the ship. While Zabel can withstand being attacked by the three martial artists, the prospect of Hsien-Ko threatening him is too much, and he leaves. With the monsters gone, the group get to know each other: Ken mistakenly believes Fong Ling and fellow martial artist Chun-Li are sisters; Bruce imagines how hard it would be to explain what just happened to his US-STRATCOM commanders, and Fong Ling and Hsien-Ko bond in making fun of Bruce, much to Regina's confusion. The ship continues on for Japan.
Bruce; Fong Ling; Hsien-Ko and Regina arrive in Japan and head outside the Mishima Zaibatsu building to investigate their involvement with a virus. Regina has heard of this organization, which has begun Third Energy research in the ruins of the Ibis Island facility; she considers Shadowloo to be more dangerous however. After an argument over Regina's appearance; Hsien-Ko's participation in the group and what the martial artists from the boat are doing, Bruce gets them back to the issue: they have orders to link up with Shinra, who he understands is an "anti-occult" organization.
Inside the building, Heihachi Mishima and Bakuden discuss the agents outside; Heihachi concludes they are here to investigate them and believe he has the virus they're looking for. He reveals that his possession of the virus was to fulfill a larger plan, but he does not possess it. Black Bravoman, an associate, leaves to fight them.
Back outside, the group begins discussing how Hsien-Ko can exist, eventually accepting in the powers of Oriental magic. Moving on, Regina asks Hsien-Ko why they encountered Zabel Zarock on the cruise liner in the first place. Hsien-Ko reveals that there is a power energy coming out of Tokyo which is responsible for the interdimensional holes, itself explaining the "monster" reports.
The gang are soon attacked by robots led by Black Bravoman, but are helped by the arrival of Kazama Jin, who Bruce reveals is the grandson of Heihachi Mishima. When the robots are defeated, the gang and Jin are found by Xiaomu's gang. Hsien-Ko gets acquainted again with Felicia, a fellow Dark Stalker. After another fight with Black Bravoman, a Quake occurs and the gangs are surrounded by Kamaitachi, yōkai from Japanese mythology. After more fighting, they encounter a mysterious woman involved in incident intimately, who was also responsible for the death of Reiji's parents in the Shibuya battle ten years prior. She gingerly mentions the involvement of Shadowloo member Vega before leaving.