A possible concise summary is:
Ananya and Debu are working at a quarantine center in a college that has problems with water and electricity. They meet the dean and the principal who are actually Bambaal and Mirza, two evil beings from the ocean world who want to destroy the earth. Bambaal goes to the Dark realm to find the most powerful person who can help him. Debu is actually Baalveer, a superhero who also goes to the Dark realm to find a weapon that can heal his mother. Ananya tries to contact the masked man, who is Vivaan, Baalveer's partner, but he ignores her. Vivaan misses Shinkai, his friend from the ocean world.
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