What platforms is Onegai Monsters on?

Onegai Monsters was released on Nintendo 64.

When did Onegai Monsters release?

Onegai Monsters was first released on May 9, 1999.

Onegai Monsters

May 9, 1999StrategyNintendo 64

Onegai Monsters — frequently asked questions

What platforms is Onegai Monsters on?: Onegai Monsters was released on Nintendo 64.
When did Onegai Monsters release?: Onegai Monsters was first released on May 9, 1999.

About Onegai Monsters

The game is a 3D RPG in which the player character is a child who starts a journey to become a monster breeder on his tenth birthday. After receiving and hatching an egg, the player walks around the world, completing requests from people and raising monsters. Requests are basic RPG quests—such as collecting an item for a non-playable character—and the monsters fight in Pokémon-style, turn-based battles. Unlike Pokémon, every monster in the game comes from the one baby that the player receives as their first monster. Depending on the food it is fed, the monster gains element points, which determine how it evolves. Monsters level up both through defeating other monsters and when walking around the town. Monsters hatch from eggs that can be bought at the local monster shop.

Summary via IGDB.

Game details

Platforms: Nintendo 64
Developer: Bottom Up
Publisher: Bottom Up
Game modes: Single player
Themes: Fantasy

Details via IGDB.

Collector value & authenticity

Nintendo 64 · PriceCharting sold data · Verified 2026-10-22

Loose

Complete

$38

few sales

Sealed

—

How often it sells

Loose: about 3 times a year
Complete: about once a year
Sealed: rarely — fewer than one recorded sale a year

Prices marked “few sales” rest on about one recorded sale a year, so treat them as a rough guide: the next copy could sell well above or below. Expect to wait for one to come up.

Sales frequency from PriceCharting's completed-sale records, as of 2026-10-22.

Price over time

Loose
Complete

A loose copy sold for about $1.75 in Oct 2019, $5.46 five years ago, and $7.76 as of Oct 2026.

Show as table

Month	Loose	Complete
Jan 2020	$1.75	$6.53
Jan 2021	$1.99	$10.00
Jan 2022	$7.00	$17.48
Jan 2023	$10.40	$26
Jan 2024	$13.95	$35
Jan 2025	$13.12	$38
Jan 2026	$1.00	$38
Oct 2026	$7.76	$38

Monthly price estimates from PriceCharting's completed-sale records, sampled quarterly, through Oct 2026.

Release record

Territory	Date	Cartridge serial
Japan	9 April 1999	NUS-NOMJ-JPN

Source: Serials and board numbers: MAME's Nintendo 64 software list (read from dumped cartridges); serials cross-checked against the No-Intro serial records in the libretro database and, for North American carts, gameverifying's N64 board list, and published only where two of them agree

Region: JP
Released: 1999
Authenticity: Low

Modern re-releases, such as Nintendo Switch Online, are not tracked hereLow counterfeit risk

Nintendo 64 prices, all games & how to spot a fake

A Japan-only cart from Bottom Up that is cheap enough to buy on curiosity.

Onegai Monsters was developed and published by Bottom Up and released in Japan in April 1999. It came out only in Japan, so this is a Japanese-language game best suited to players who read Japanese.

Before you buy

Fake risk is low. This is the Japanese cartridge, so there is no other version to choose between. Loose copies sit below the median for Japan-only games, and a complete copy costs several times the loose price.