激カワ同期女子の一日彼氏になったボク。まさかのご指名に戸惑うも仕方なく責任を全うしようと奮闘するが空回りの連続…。実家の挨拶を無事済ますとご両親に必要以上に気に入られ、一緒にお風呂に入ったり、同じベッドに寝る事になったり、とにかく一日彼氏がバレないようにイチャイチャと恋人同士のフリを続けていくうちに…

I became the boyfriend for a day for a super cute female colleague. Though bewildered by her unexpected request, I reluctantly tried my best to fulfill my responsibilities, but my efforts were constantly in vain… After successfully meeting her parents, they took an excessive liking to me, and we ended up bathing together, sleeping in the same bed, and generally trying to keep my secret as a boyfriend for the day…