Event: Visitors of the Rainy Season

Quest: Kappa's Wish

Talk with DB Katori.
Defeat any "Kappa Bully" demons around the Obelisk in Nakano, Shibuya, or Ichigaya and collect 10 Demonic Cucumber.
Report to DB Katori.
As a reward, DB Katori will give you Demonic Cucumber (Fresh)

After completing the initial quest, the rest of the Demonic Cucumber can be exchanged for different prizes given the right amount repeatably.

Level	Name	Race	Experience	Magnetite Drop	Macca Drop	Misc. Drop
Cannot be Contracted
70	The Kappa Bully Azumi	Brute	30,000	270 - 329	-	2 Demonic Cucumber
75	The Kappa Bully Kelpy	Fairy	100,000	907 - 1,097	-	10 Demonic Cucumber
85	The Kappa Bully Isora	Yoma	350,000	3,161 - 3,801	-	100 Demonic Cucumber
90	The Kappa Bully Forneus	Fallen Angel	1,000,000	9,315 - 19,489	-	500 Demonic Cucumber

Occasionally a "mini boss" appears in the field in one of the spawn location, and when it is defeated a message is displayed on the screen. Only 1 mini boss spawns in each field.

Nakano
Kelpy appears as the mini boss. [X22:Y19] Azumi [X22:Y20] Azumi [X16:Y18] Azumi [X23:Y17] Azumi

Shibuya
Isora appears as the mini boss in Azumi spawn locations. [X19:Y18] Azumi [X20:Y20] Azumi [X23:Y18] Azumi [X23:Y19] Azumi [X21:Y19] Kelpie [X22:Y19] Kelpie [X22:Y19] Kelpie

Ichigaya
Forneus appears as the mini boss in Azumi and Isora spawn locations. [X17:Y16] Azumi [X17:Y21] Azumi [X24:Y16] Azumi [X24:Y21] Azumi [X18:Y17] Kelpie [X18:Y21] Kelpie [X22:Y17] Kelpie [X23:Y20] Kelpie [X20:Y20] Isora [X21:Y19] Isora [X20:Y18] Isora [X19:Y19] Isora

During the event, rain poured in Nakano, Shibuya, and Ichigaya.
Before the full event was implemented, only the demons appeared with mixed experience points. Kappa Bully Azumi and Forneus's experience points were switched therefore players were able to gain 1 million per each Azumi.