Nagatoro's Seiyu is Uesaka Sumire. She's known for voicing Shalltear, which is funny considering Peroroncino is absolutely the kind of person who'd be a fan of 774.
"Yesterday I was reading about what girls do to excite their boyfriend so I can practice it on you. "
"ha ha what a quirky thing to do to a totally platonic friend"
Oh, I get it. It shoots petals and alternates between two words like how you pick petals off a flower and alternate between "He loves me." and "He loves me not."