[Onizuka Naoshi] Tsuntsun (Undertow) [S.T.A.L.K.E.R]

A pair of sisters shares a dark-haired man, and jealousy, denial, and possessiveness drive their interactions from awkward bedroom tension into physical intimacy. Swimwear and rumpled bedding mark the escalating encounters, while a final poolside portrait leaves the sisters standing close together with uneasy expressions. The cover reads “Tsun-tsun,” and the closing page credits the translation and typesetting to S.T.A.L.K.E.R.