The uninhabited Cycladic island of Rhenea, neighboring Delos and Mykonos, played an unusually significant role during the years of the Peloponnesian War. To ensure the island's fascinating story remains unforgettable over time, the old Yakoumis plants an Immortal, which, due to its strange life cycle, he considers suitable for this purpose.

The thorny plant with the blue leaves, although initially afraid that it will not succeed in becoming a symbol of immortality, ultimately manages to provide the precious offering that it is asked for, thanks to the help of the vine Agraabelis, which takes root nearby and over time becomes a good friend.

The friendship between the two plants remains unscathed by time to this day because it thrives on sharing and is based on love. "Friends are a capital of life. Generosity and selflessness make the blossom of friendship wonderful and precious." With entertaining activities and many suggestions to promote reading appreciation.