tl;dr: stop what you're doing in the screenshot, you'll regret it later.
This is the memoria system, you get them through Kotori's and add them onto cards for enhancements.
For example, your 1st one will enhance the healing on this card by 1%, since Sage Kotori is not a healing card, this will have no use.
Your 2nd one will add 1% instadeath onto the attack, which isn't that great on a *5 and since the memoria is tiered with higher tier memoria needing this specific memoria item to craft, I suggest you keep it for that purpose since its raw material are hard to come by.
Also, once it's enhanced it can't be taken off from the card which is why I suggest you not to use these specific 2 on this card.