Divine Beddings

The Divine Beddings are artifacts created by the God of Darkness supposedly for the God of Creation. If all parts are gathered by a single individual they become an immortal demigod

Keima wants to collect all of the pieces to become immortal so he can be with Rokuko. After making a contract with Hugo, he was sent to gather information about the Beddings.

It has 7 parts:

The futon, - Rokuko and Leona has 1-1 but one of them is fake the mattress - Haku has it, it can fly - House Orklov protects it
 * Effect: You can sleep with anyone you wish. Fate itself will be manipulated, and none will interfere until morning. If it is physically impossible to meet the one you wished for, you will meet in your dreams instead. Note: This effect can be used only once per 8760 hours (365 days). Note: As the one you wish for will be summoned against their will, they may arrive feeling confused or disjointed. This will recover by morning. The dreams you have will be shared with them. You can freely select the contents of the dreams. The owner of the bedding has priority here. Note: The owner can select whether the memories of these dreams will be retained. If you sleep within this futon for over one hour, all of your strength and mana will be restored. Even if you sleep for less than one hour, you will still regain some of both. Injuries are not cured. Note: If one other than the owner sleeps in this futon without permission, their strength and mana are drained instead. Additionally, sleeping in this futon makes it more likely for convenient things to happen to the owner. The extent of this depends on the owner’s luck.

the pillow - the Tsia family holds it currently

the nightcap, 

the quilt, - Rokuko got it as a reward from the God of Darkness after the Dungeon Battle against 564 '''the pajamas - The technical first of the Divine Beddings Keima 'officially' obtains as his own. Won from Core 50 after managing to land three strikes against the core.'''
 * The Divine Quilt, alongside the shared ability among the Divine Beddings to boost recovery and health, can create a barrier around the user making it impossible for outside forces to interfere with the user's sleep.
 * The Divine Pajamas has two main abilities. The first is that it transforms into whatever the wearer finds to the most comfortable. The second is that it will automatically move the wearer's body to defend against anyone interfering with their sleep.
 * Trivia: The God of Darkness considers this bedding somewhat of a failure since the Divine Quilt already generates a protective barrier making the Pajama's effects unnecessary. The only way for it to activate is if someone who is under the quilt, thus sleeping with the user, attacks them in some way.

the underwear, 

the alarm clock - it was destroyed by the God of Creation and become the underwear. After the Dungeon battle against Core 564, the Dark God rewards a newly reconstructed Divine Alarm Clock to Keima.
 * Ironically, its ability is to 'awaken' anyone who hears it. Making them completely refreshed and well-rested even if they were exhausted previously. It will even lift any status alignments currently affecting whoever hears it. This effect is powerful enough to lift the Divine Futon's influence on a person called with its power. It does not, however, overturn how the Futon will influence fate.
 * Trivia: Pretty much everyone agrees that the Alarm Clock doesn't count as bedding.