I Bought a 0.01mm Condom I Wasn't Going to Use in Front of my Senpai!

I Was Treated Like a Child by a Cute Senpai at My Part-Time Job, So I Bought a 0.01mm Condom I Wasn't Going to Use in Front of Her After My Shift to Show Off.
Then, From the Next Day Onwards, Senpai Started Acting Strange

A romantic-comedy about a high school boy who wants his cute senpai attending an all-girls college to treat him as an adult, and their relationship begins when he shows off and buys a cond*m right in front of her.

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This is a translation!!!!!