Kashima Ouka[]
Chigusa and Ouka are childhood friends. Chigusa is shown to have feelings for Ouka which was why Mikoto and Chigusa didn't take Ouka along with them to the Entertainment District to search for Haruhime.
Chigusa also is shown to express her deep care for Ouka when he tells her to give him her shield to fight the Black Goliath, to which she refuses to let him go, in fear that he would die. After Ouka received a devastating hit from the Black Goliath when he protected Bell, Chigusa tended to his wounds and stayed by his side until he woke up.