A 5-star summon is guaranteed, but I’m quite sure the item required for this summoning can only be purchased.
☆ NintendObs Weekly – Monday, November 19, 2018 – Sunday, November 25, 2018.
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…
…Wanna play? Buy a 3DS.
That being said, click on Dragalia Lost for everything you need to know about the game. 😀