To discover the origin of love, we must go back...... to primitive times!
 
Originally released as a two-parts oneshot in Shounen Sunday S, and later serialized in Sunday Web Every.

One day a long time ago, my great great great great great (abbreviated) grandfather and your great great great great great (abbreviated) grandmother discovered love. This was humankind's first experience of the emotion and also the beginning of the first ever love comedy. 
Note: includes a bonus chapter in volume 2.

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