The year is 2064. The Hibinos may look like your average family, but middle-aged housewife Saeko Hibino has a secret: she was a Child Prodigy who created an antimatter fusion reactor at the age of 17. Thus, the local crime syndicate Haraguro-dan, led by the evil CEO Herograw, has devised a plan to kidnap her and force her to complete a doomsday device. When the kidnapping succeeds, her husband, a former professional wrestler named Rando, shout: THEY'RE GOING DOWN!!! And he's not the only Hot-Blooded one: his daughter, fighting prodigy Rio Hibino, and Saeko's assistant Toratarou Minoru join him in this rescue mission.
The gameplay is your standard beat 'em up fare: you have three characters to choose from: Rando, Rio, and Tora, each one with their own set of special moves at your disposal. They can also pick up and fire weapons and use a Desperation Move.
This game has absolutely no relation to the more popular Kunio-kun series.
Nekketsu Oyako provides examples of:
- Action Girl: Rio, who's as hot-blooded as her dad, fights with a shape-shifting hammer as her weapon.
- All There in the Manual: Most of the game's plot can only be found in the manual.
- Badass Family: A father, daughter, and an assistant team up to beat the crap out of the evil syndicate that has kidnapped the matriarch of the family.
- Console Cameo: Depending on the version, several PlayStations or Saturns can be seen in the background of World 1. The consoles also appear as an item.
- Developer's Foresight: There're many consumables that restore your health, but if you're playing as Tora or Rio, trying to pick a Beer will result in a message: "Adult Only". Also, only Rando can pick and use the Bazooka (and only the Bazooka).
- Excuse Plot: The Big Bad has abducted the matriarch of the family. Are you a hot-blooded enough family to save her?
- Fragile Speedster: Rio's fast but she can't take much damage.
- Girlish Pigtails: Rio sports a pair.
- Hot-Blooded: As the title suggests, every playable character is one.
- Jack of All Stats: Tora's the most balanced of the playable character.
- Mighty Glacier: Rando's slow but he does a lot of damage.
- Morph Weapon: Rio's hammer changes onto a fist and a palm on some attacks, and it can do a middle finger downward attack too.
- Multiple Life Bars:
- Your character can have a second life bar by picking up healing items after your first bar is full. This was removed in the Saturn version.
- Most of the enemies have them, especially on the higher difficulties, although even in the hard difficulty, they doesn't have more than two except the Final Boss, who has three.
- One-Winged Angel: After he's defeated for the first time, Herograw will transform into a muscular parody of the classic superhero, complete with bright tights and a star emblem decorated cape.
- Retired Badass: Rando's a former pro wrestler.
- Stuff Blowing Up: There's more explosive weapons and/or scenery objects in this game that others of its genre. And some enemies can use them, too.
- Updated Re-release: The Saturn port has more animation frames for the characters and everyone has more moves. In addition to some tweaks to gameplay, this version has a remixed soundtrack and features some visual effect changes due to the Saturn being incapable of drawing translucent textures.
- Wrestler in All of Us: Rando can perform a pliedriver on his unfortunate opponents.
