Castiel, Garden of Eden — romance route and diamond cost

Castiel, the idol, has the most expensive and the longest route in Garden of Eden: 6 steps, all paid, 307 diamonds.

Every romance step by episode

Season 1, episode 8 · Intimacy

Protest.55diamonds
Thank him warmly.55diamonds
I do.65diamonds

Season 1, episode 9 · Under the Mask

Will you play for me? (choice available if you have a close relationship with Castiel)29diamonds

Verdict: the top price, one heavy episode

Castiel costs 307 diamonds, about twice Seong-hwa's 146 and three times Dean's 100. All 6 steps are paid. More than half the bill lands in one episode: Episode 8, Intimacy, with three choices for 175 diamonds.

Every step

Episode 3, Solidarity: "Find a blanket to cover him with." — 50.
Episode 6, With a Smile: "Wanted to throw myself into his arms." — 53.
Episode 8, Intimacy: "Protest." and "Thank him warmly." at 55 each, then "I do." for 65.
Episode 9, Under the Mask: "Will you play for me?" — 29. It appears only if you're close with Castiel.

How I'd play it

Pay Episodes 3 and 6 as they come; they build the relationship that unlocks the Episode 9 choice. Episode 8 is the one I'd keep on a separate save slot for Diamond Rush: that leaves 132 diamonds out of pocket. Seong-hwa also has steps in Episodes 6 and 8, so save before Episode 6 if you're torn. Compare with Seong-hwa or Dean.

Other love interests

Questions and answers

How many diamonds does Castiel's route cost?

307 diamonds for 6 paid choices over the 10 episodes of the story.

What is the most expensive choice for Castiel?

"I do." in Episode 8, Intimacy, for 65 diamonds. The same episode has two more choices at 55.

Why can't I see Castiel's choice in Episode 9?

"Will you play for me?" is only offered if you have a close relationship with Castiel, so the earlier steps matter.

Castiel: how to romance them in Garden of Eden