Boys' Love Novels Double helix (8) hyperbola Character Library

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0, who started to call Naoto frequently after his grandfather's funeral.
The soft and gentle tone of Naoto soothes 0, who is gasping with the air of a heavy house.
However, his younger brother, Ei, is not convinced by 0.
Why do you make a sweet voice to the son of Keisuke, whom you hate, even though you don't depend on yourself? The brothers deepen the cracks in Ei, who is irritated and angry.
On the other hand, Masanori, who is secretly annoyed by the existence of 0, answers the phone call from 0 while Naoto is absent?