Is To Heart 2 Adnext hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 2 episodes · PG-13 - Teens 13 or older
Comedy, Harem, Romance
Komaki Manaka daydreams about classmate Kono Takaaki but is too shy to talk to boys. As Takaaki-kun helps her in the library they resolve to have training sessions there, calling each other by first name. When Manaka addresses Takaaki-kun outside the library, his buddy Kosaka Yuji overhears them and tells their classmates how close these two have become, causing a surprising effect on other girls around Takaaki. (Source: ANN)
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