The method of sealing cards in which the user rubs and strokes the female characters in the game has been criticized as inappropriate by Western commentators.

Four Famitsu reviewers scored the game 8, 9, 8 and 8 out of 10, for a total score of 33/40. Monster Monpiece currently holds a score of 68% at GameRankings, and 67/100 at Metacritic. While the PEGI rating in Europe was lighter, the game received an ESRB rating of M in the United States at the request of Idea Factory International, who opted for a stronger rating citing the sexual nature of the game. Imagery for the high level evolution forms of the Vampire, Kraken, Goblin, Cockatrice, Kobold, Skeleton, Titania, Bahamut, Fia, Brownie, Pegasus, Mandragora, Mau Sibau, Rafflesia, Death Scorpion, Phantom, and Tengu cards have been removed. Following the cut, PEGI has given the game a rating of 12+, compared to the CERO D (17+) rating of the original Japanese version. The English localization features all gameplay features and complete storyline, however several card images were cut from the North American and European versions of the game, citing concerns regarding the sexual nature of the imagery. Unlike the original Japanese version, the English localization is a digital-only title. The release dates for the localization was initially announced on May 9, with the game planned to be released on May 27 in North America and May 28 in Europe, however, the European release date was later pushed back to June 4 this was done in order to allow the game to be available in Germany, Russia, and Switzerland, where it was originally unavailable. An English localization for Monster Monpiece was announced by Compile Heart on January 21, 2014. The game includes artwork of legendary creatures re-imagined as girls from more than 50 different artists. Originally slated for release in spring 2013, in November 2012 it was announced that the release would be moved up to January 24, 2013. The game is developed for the PlayStation Vita by Compile Heart, the creators of Hyperdimension Neptunia. Trying to learn what master plan has been unleashed, May follows Elza, gathering treasure scattered across the world, and using the monster girls' Magus Quartz crystals to help on the way. May, Fia, Elza, and Karen are best friends at the Academy of Kunaguvu ( クナグヴァ) where they learn to become Masters of the monster girls, but a mysterious person curses Elza and she becomes Lost. In the world of Yafanir ( ヤファニール) in which two enormous pillars known as the Hammers of God penetrate the Earth, a race known as the monster girls have come to coexist with humans. Touching the monster girls also causes their chest and thighs to jiggle in response. The game utilizes an 'extreme rub' system (known officially as the 'First Crush ❤ Rub' mode) to seal cards: 'Poking, rubbing, and touching' the Vita's screen removes the character's clothing in stages, 'from thick clothes to lightly dressed to skimpy bathing suit.' The sealing system is split into two parts: one requires the player to poke or tap on the female character's private parts and the other requires the player to stroke the entire screen on both sides of the system (pictured). Neptune from Hyperdimension Neptunia receives a cameo appearance if the player reserves the game. Booster cards support other cards in play by increasing the strength of their attacks or increasing the healer's abilities. Healer cards can heal the wounds of other friendly cards in play. Ranged cards do not have as strong of attacks, but they can attack enemy cards from a distance. Melee cards have strong attacks, can survive many attacks, and are good for close-ranged combat. The four types are melee, ranged, healer, and booster. The game contains over 100 different cards divided into four types, and not all of them are 'monsters'. During a player's turn, he or she can drag and drop monster girl cards onto the grid field to activate them. Battles are turn-based and take place on a 7x3 grid in which cards can be placed. Monster Monpiece is a card battle game where users collect virtual cards and use them to battle foes.

Monster monpiece vita uncensored vok