Koi wa Ina Mono Myōna Mono or also known as Koiha Ina Mono Mouna Mono (恋は異なもの妙なもの , trans. "Love is a Strange and Different Thing") is a fictional manga written and illustrated by Japanese author Taishi Zaō (also known for her shōjo works under the name Mikiyo Tsuda) in 2002.
Koi and Koiha are interchangeable.
I made a guess.
( z1 interchange :ARG1 ( z2 person :name ( z3 name :op "Koi" ) ) :ARG2 ( z4 person :name ( z5 name :op "Koiha" ) ) )