She is first found sleeping on the field at Iliasville. If you speak to her with Rami in your party, you have the option of recruiting her.
Rumi: "I'm tired"
Rami: "I bought a sparkler! Let's play!"
Rami: "...It's sooo pretty. ♪ Aww, it's about to go out."
Rumi: "The sparkler is the same as your life..."
Remi: "I brought a jump rope... let's compete on how many jumps we get."
Rumi: "I'll consent to that."
Rami: "Hnnn, it's hard to jump because my boobs giggle! Do either of you know why that happens?!"
Remi: "(Air resistance.)"
Rumi: "(Air resistance.)"
Rumi: "I'm tired."
Barbun: "You seem tired a lot. Do you have any troubles you want to tell big sis about?"
Rumi: "Breathing is such a bother..."
Barbun: "That's what you are bothered by? Such a troublesome child."
Lily: "This child, you seem unmotivated every time I see you. Maybe you were abused as a child and closed your heart to the world?"
Lily: "If you have troubles, leave them to me. I will lend you my power."
Rumi: "Your power looks handy... You can scratch your back even while lying down."
Lily: "You should be able to do that with your arms... Just how lazy are you?"
With Alma Elma:
Rumi: "Alma Elma-senpai! Osu!"
Alma Elma: "Ufufu… Rumi, you're always so full of spirit..."
Rumi: "*fwoosh* *woosh*…"
In the 1st Camp:
In the 2nd Camp:
She is required in "Imp Rhapsody" and "Nurse Examination" scenes.
Rumi goes limp! (Nothing happens)
Rumi has fallen asleep. (Rumi Sleeps)
Rumi: "Can we get this over with?"
Rumi is unusually motivated!
Rumi has temporarily gotten stronger! (+30% Evasion, +30% Magic Evasion, +50% Hit Rate, +50% Critical Hit Rate for 4 turns)
Rumi: "Dig, dig."
Rumi tries to dig a pit!
But it was too much trouble and she stopped. (Nothing happens)
Rumi just sits and watches.
She doesn't even try. (Nothing happens)
Rumi tears off her tail and tosses it over!
...Is that supposed to help? (+1 Succubus Tail)