Isn't My Wife Just the Cutest?

Tsuyoshi considers himself the luckiest man alive. He is happily married to Tsubasa, his beautiful and buxom high school sweetheart, and they are eagerly planning to start a family together. Every night is filled with marital bliss, and he believes their love is unshakable.

However, Tsuyoshi's perfect world begins to crack when Tsubasa starts spending more and more time away from home. His suspicions grow after she encounters his muscular and charming former classmate. Doubt creeps in as he wonders if his sweet, shy wife could ever be hiding something from him, threatening the foundation of their relationship.