The Bride Is a Well Brought up Boy

Having lived as the second son of a temple, worshipped as a deity, and being a sheltered boy capable of transforming into a snake, Sei finally decides he's had enough of this life, and sets out to run away from home! Not being used to human society, Sei gets worn out and escapes to a grassy field where he meets and is helped by Murasaki, the reptile enthusiast college student. As the sheltered boy who longed to be "normal," Sei takes this chance to befriend the unfriendly and hard-to-read Murasaki, but their cohabitation life is riddled with misunderstandings...?! The two experience their first love together in a hot and cute love comedy!

(Source: Gentosha, translated)

Note: Chapter count includes "Shitsuke ga Nattenai! Tokubetsu-hen" and an extra chapter.