Japanese literature It is supposed to be a contract marriage, but the son of a childhood friend wants a doting marriage / Sachiko tsumugi

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Japanese literature
[Contents introduction]
Triggered by a certain circumstance, an office lady 佐奈子 who resigned from an architecture office in Tokyo.
While thinking about and worrying about the future of life, she meets her childhood friend 昂士 by chance.
Being healed by his kindness that he did not ask about the situation forcibly, 佐奈子 started a new life and meets 昂士 again.
And with momentum, she has decided to make a 『 contract marriage 』 based on the agreement of interest! The newly-married life with Sonzoshi 昂士 is surprising but comfortable, and Ko Sana is attracted to him more and more.
However, I thought this relationship was just a contract, but after one night, the 昂士's love of drowning does not stop?
[Author's brief history]
In 2024, at Alphapolis "17th Romance Novel Grand Prize", she married a childhood friend 『 by contract, but before I knew it, it became a love of drowning marriage. 』 received an encouragement prize.