Fushigi No Rin

ふしぎの RIN is a Manga Japan board of Michiyo Akaishi. Begun in 1990, it comprises 6 volumes.
Not published in French.

Short summary of the history

Rin Ôgidani (扇谷霖), and Seiya Michinobe (道之辺聖夜), friends of childhood in second year of college, see their life suddenly upset because of a mysterious package addressed to the father of Seiya. In this package two capsules, Seiya and Rin are by breaking each one accidentally one in turn. These capsules “something leaves” which returns in their body. Each one has then like a second personality, which sometimes speaks in their place, or acts for them. Rin becomes very gifted in gymnastics and tennis, whereas it forever touched a racket.

However these two entities are not inevitably friendly, and Rin and Seiya are unaware of from where they come. And, roof, they are nourished of gold, decaying if they do not eat any. Their death being explosive, Rin and Seiya will do everything not to let them die and not explode with them…

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