Items in-game have various effects such as refilling LP/AP, scouting or progressing in a card's idol road.
You can find the amount of items you have in your locker that can be found on the map, or listed in your room in your stat section. When receiving an item through events, it will wait inside your present box. Items in the present box expire thirty days after being received.
All AP/LP refill items expire a day after the current event ends.
A tactic that you can abuse to store LP and AP refills for events is to collect items, but leave them in your present box so that they do not expire for thirty days and usable in the next event.
Locker
The locker contains Yakisoba Bread, Konpeitou, Sports Drink and Story Keys. It can be found in the middle section of our map. The locker shows the items you have, as well as their expiration date.
Item
Name
Effect
How to obtain
Expires
Sports Drink
Recovers full LP
Point reward bonuses in events, rewarded one each day on second half of events, as well as certain special event rewards
Day after event end
Konpeitou
Recovers one point of LP
Point reward bonuses in events, as well as certain special event rewards
Day after event end
Yakisoba Bread
Recovers full AP
Point reward bonuses in events, as well as certain special event rewards
Day after event end
Diamonds
Recovers one point of LP, recovers full AP for five diamonds, used for scouting, unlocks idol road nodes when insufficient gems
Bought in the store, point reward bonuses in events, reading event stories, completing missions, as well as certain special event rewards
Never
Producer Points
Leveling cards, producer point scouting
Point reward bonuses in events, reading main and sub stories, selling cards, event ranking rewards, receiving a card of which you have five copies already, as well as certain special event rewards
Never
Story Keys
Unlocks one story chapter
Special events
Never
Gems
Unlocks idol road nodes and betters card stats
Dropped during lessons, collecting 100 gem fragments in a lesson awards one small gem of that type.