Tsukasa had been living happy days since marrying Rui. Their private secrets, casual conversations, and memories of laughing together—Tsukasa keeps every single bit of it tucked away deep in his heart. One night, while watching the sleeping Rui, Tsukasa smiled softly.

Because he is so happy, he is terrified of losing it. That is why Tsukasa couldn't voice his love, his anxiety, or the words he left unsaid, trying to protect their happiness by bottling it all up. But that love had begun to silently warp, growing into something that could no longer be contained by mere kindness.