Liar and First Love

Izumi realized from a young age that his romantic orientation is towards the same sex. Even now as a working adult, he continues to hide that fact, and pretends to be "normal".

One day, he is reunited with his friend, Shion, whom he had been estranged with for years. As Shion blames him for losing contact with him, Izumi reveals that the reason why he kept his distance was because of his romantic feelings for Shion.
Shion also confesses that he loves him back, and they end up dating.

They spend every day lovey-dovey and happy, but sometimes Shion's behavior seems off...?