Out of all the 77th (before the tragedy) class Komaeda trusted Chiaki the most. She always has hope, which Komaeda loves. That's why he asked her to come with him, when looking for Mikan.
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He always asked her for help though, always.
Of course Chiaki didn't mind and did.
(Why is she such a nice person ;-;)
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A/N
And if anyone asks, yes I'm a komanami shipper~
I feel so guilty for shipping it T-T
