Namco × Capcom

Namco × Capcom is a tactical role-playing game which puts players in control of teams of characters drawn from the video game properties of Namco and Capcom. Gameplay is divided into levels, which are unlocked as the player progresses through the narrative. These levels are split between story segments told through character interactions and gameplay where party members face off against enemy parties, with victory conditions which include clearing the field of enemies. In addition to normal story missions, the player can engage in training levels using training dummies to practice moves. They can also purchase items for healing or character boosts at shops using currency won during battles and through a gambling minigame activated between certain story chapters.

Character moves and actions are dictated by Ability Points (AP), of which a set amount is assigned to each character at the beginning of a battle. The game's turn-based battles play out in a grid-based arena from an overhead perspective; each unit on both sides has their turn placed according to their current AP. Any character with ten AP can move and perform actions, with AP being recovered by doing little or nothing for each turn. Movement distance varies between characters, with some walking or flying and others being able to pass over obstacles. Playable characters appear in both pairs and as solo units, with different characters specializing in short or long-range attacks based on their abilities in their native series.

The story opens with Reiji Arisu and his kitsune mentor Xiaomu, operatives for the supernatural investigative task force Shinra, being called to deal with interdimensional rifts opening in their world. These rifts pull in beings from alternate realities, many of which ally with Reiji and Xiaomu to fight both the forces behind the rifts and opponents drawn from their native universes. The group is opposed by Ouma, a group dedicated to causing chaos, with their main rival being Ouma operative Saya, a being similar to Xiaomu. It is eventually revealed that Ouma wishes to resurrect a dark deity dubbed "99" through the merging of multiple realities.

Reiji's father Shougo fought Saya to prevent this ten years before and was forced to sacrifice himself with Xiaomu's aid to succeed. While initially defeated, Ouma succeeds in merging the worlds, and 99 is resurrected using Saya as a host. While Reiji is prepared to sacrifice himself as Shougo did, his and Xiaomu's allies return from their realities and combine their powers to cripple 99. Saya allows herself to be killed by Reiji to destroy 99 permanently.

Namco × Capcom was developed by Monolith Soft, then a subsidiary of Namco consisting of former Square employees who had gained fame through their work on the Xenosaga series and Baten Kaitos: Eternal Wings and the Lost Ocean. The game was directed and written by Soichiro Morizumi, a former employee of Banpresto and veteran of their Super Robot Wars franchise. The producer was Kouji Ishitani, who had served as an assistant director for Xenosaga Episode I and Baten Kaitos. Development began in 2003, and was initially proposed by Monolith Soft as an internal crossover of Namco characters for the company's 50th anniversary.

This led to a roster of around 100 characters, but the team wanted a larger roster. To achieve this and create a "more exciting" experience, Namco reached out to Capcom to collaborate on the project. Capcom agreed, breaking the accepted reality of the time for large rival companies not to cooperate on a project. The game was Capcom's second major collaboration with another publisher following the SNK vs.

During the weeks following its release, the game came among the top ten best-selling games, reaching sales of nearly 117,000 units by late June. By the end of the year, the game was among the top 100 best-selling games in Japan, with total sales of 131,600.

Japanese magazine Famitsu positively noted the use of kyōgen comedy routines in dialogue, but found other characters lacking development. One reviewer enjoyed the combination-based battles, but another faulted the game's balance. Gaming website Hardcore Gaming 101 said the game was "all about fan service", enjoying the character interactions but finding the gameplay itself very shallow. Siliconera similarly noted shallow and repetitive gameplay, but said that fans of both Namco and Capcom would enjoy the crossover elements.

Following the release of Namco × Capcom, the two companies would collaborate on future projects, particularly Street Fighter X Tekken and the Mobile Suit Gundam VS series. The Namco × Capcom development team would later collaborate with Banpresto on the 2008 Nintendo DS game Super Robot Taisen OG Saga: Endless Frontier. They released its DS sequel Endless Frontier Exceed, in 2010.

Monolith Soft and Banpresto later co-developed the 2012 Nintendo 3DS title Project X Zone. Designed as a successor to Namco × Capcom with similar gameplay and narrative, Project X Zone combined characters from Sega franchises with returning ones from Namco and Capcom. Its 2015 sequel, Project X Zone 2, would be developed solely by Monolith Soft and feature additional collaborations with Nintendo franchises.